Fixed broken linkes in hints file. (#3773)

Author: BethanyG

exercises/concept/cater-waiter/.docs/hints.md

@@ -10,52 +10,52 @@
 
 ## 1. Clean up Dish Ingredients
 
-- The `set()` constructor can take any [iterable][iterable] as an argument. [lists:python/lists](https://exercism.lol/tracks/python/concepts/lists) are iterable.
-- Remember: [tuples:python/tuples](https://exercism.lol/tracks/python/concepts/tuples) can be formed using `(<element_1>, <element_2>)` or via the `tuple()` constructor.
+- The `set()` constructor can take any [iterable][iterable] as an argument. [concept: lists](/tracks/python/concepts/lists) are iterable.
+- Remember: [concept: tuples](/tracks/python/concepts/tuples) can be formed using `(<element_1>, <element_2>)` or via the `tuple()` constructor.
 
 ## 2. Cocktails and Mocktails
 
 - A `set` is _disjoint_ from another set if the two sets share no elements.
-- The `set()` constructor can take any [iterable][iterable] as an argument. [lists:python/lists](https://exercism.lol/tracks/python/concepts/lists) are iterable.
-- In Python, [strings:python/strings](https://exercism.lol/tracks/python/concepts/strings) can be concatenated with the `+` sign.
+- The `set()` constructor can take any [iterable][iterable] as an argument. [concept: lists](/tracks/python/concepts/lists) are iterable.
+- In Python, [concept: strings](/tracks/python/concepts/strings) can be concatenated with the `+` sign.
 
 ## 3. Categorize Dishes
 
-- Using [loops:python/loops](https://exercism.lol/tracks/python/concepts/loops) to iterate through the available meal categories might be useful here.
+- Using [concept: loops](/tracks/python/concepts/loops) to iterate through the available meal categories might be useful here.
 - If all the elements of `<set_1>` are contained within `<set_2>`, then `<set_1> <= <set_2>`.
 - The method equivalent of `<=` is `<set>.issubset(<iterable>)`
-- [tuples:python/tuples](https://exercism.lol/tracks/python/concepts/tuples) can contain any data type, including other tuples.  Tuples can be formed using `(<element_1>, <element_2>)` or via the `tuple()` constructor.
-- Elements within [tuples:python/tuples](https://exercism.lol/tracks/python/concepts/tuples) can be accessed from the left using a 0-based index number, or from the right using a -1-based index number.
-- The `set()` constructor can take any [iterable][iterable] as an argument.  [lists:python/lists](https://exercism.lol/tracks/python/concepts/lists) are iterable.
-- [strings:python/strings](https://exercism.lol/tracks/python/concepts/strings) can be concatenated with the `+` sign.
+- [concept: tuples](/tracks/python/concepts/tuples) can contain any data type, including other tuples.  Tuples can be formed using `(<element_1>, <element_2>)` or via the `tuple()` constructor.
+- Elements within [concept: tuples](/tracks/python/concepts/tuples) can be accessed from the left using a 0-based index number, or from the right using a -1-based index number.
+- The `set()` constructor can take any [iterable][iterable] as an argument. [concept: lists](/tracks/python/concepts/lists) are iterable.
+- [concept: strings](/tracks/python/concepts/strings) can be concatenated with the `+` sign.
 
 ## 4. Label Allergens and Restricted Foods
 
 - A set _intersection_ are the elements shared between `<set_1>` and `<set_2>`.
 - The set method equivalent of `&` is `<set>.intersection(<iterable>)`
-- Elements within [tuples:python/tuples](https://exercism.lol/tracks/python/concepts/tuples) can be accessed from the left using a 0-based index number, or from the right using a -1-based index number.
-- The `set()` constructor can take any [iterable][iterable] as an argument.  [lists:python/lists](https://exercism.lol/tracks/python/concepts/lists) are iterable.
-- [tuples:python/tuples](https://exercism.lol/tracks/python/concepts/tuples) can be formed using `(<element_1>, <element_2>)` or via the `tuple()` constructor.
+- Elements within [concept: tuples](/tracks/python/concepts/tuples) can be accessed from the left using a 0-based index number, or from the right using a -1-based index number.
+- The `set()` constructor can take any [iterable][iterable] as an argument.  [concept: lists](/tracks/python/concepts/lists) are iterable.
+- [concept: tuples](/tracks/python/concepts/tuples) can be formed using `(<element_1>, <element_2>)` or via the `tuple()` constructor.
 
 ## 5. Compile a "Master List" of Ingredients
 
 - A set _union_ is where `<set_1`> and `<set_2>`  are combined into a single `set`
 - The set method equivalent of `|` is `<set>.union(<iterable>)`
-- Using [loops:python/loops](https://exercism.lol/tracks/python/concepts/loops) to iterate through the various dishes might be useful here.
+- Using [concept: loops](/tracks/python/concepts/loops) to iterate through the various dishes might be useful here.
 
 ## 6. Pull out Appetizers for Passing on Trays
 
 - A set _difference_ is where the elements of  `<set_2>`  are removed from `<set_1>`, e.g. `<set_1> - <set_2>`.
 - The set method equivalent of `-` is `<set>.difference(<iterable>)`
-- The `set()` constructor can take any [iterable][iterable] as an argument. [lists:python/lists](https://exercism.lol/tracks/python/concepts/lists) are iterable.
-- The [list:python/lists](https://exercism.lol/tracks/python/concepts/lists) constructor can take any [iterable][iterable] as an argument. Sets are iterable.
+- The `set()` constructor can take any [iterable][iterable] as an argument. [concept: lists](/tracks/python/concepts/lists) are iterable.
+- The [concept: list](/tracks/python/concepts/lists) constructor can take any [iterable][iterable] as an argument. Sets are iterable.
 
 ## 7. Find Ingredients Used in Only One Recipe
 
 - A set _symmetric difference_ is where  elements appear in `<set_1>` or `<set_2>`, but not **_both_** sets.
 - A set _symmetric difference_ is the same as subtracting the `set` _intersection_ from the `set` _union_, e.g. `(<set_1> | <set_2>) - (<set_1> & <set_2>)`
 - A _symmetric difference_ of more than two `sets` will include elements that are repeated more than two times across the input `sets`.  To remove these cross-set repeated elements, the _intersections_ between set pairs needs to be subtracted from the symmetric difference.
-- Using [loops:python/loops](https://exercism.lol/tracks/python/concepts/loops) to iterate through the various dishes might be useful here.
+- Using [concept: loops](/tracks/python/concepts/loops) to iterate through the various dishes might be useful here.
 
 
 [hashable]: https://docs.python.org/3.7/glossary.html#term-hashable