On wrong append call, help users pass-by-pointer

WHY?

First Odin users that try to use append often forget to pass a pointer,
and pass-by-value.

This is a first attempt at helping with that, but a better version would
be a generic way to check when any proc values should be pass-by-pointer instead of
pass-by-value, as discussed at https://forum.odin-lang.org/t/least-parsable-most-common-error-message/1241/3

Author: duchainer

src/check_expr.cpp

@@ -7283,6 +7283,10 @@ gb_internal CallArgumentData check_call_arguments_proc_group(CheckerContext *c,
 			error_line("\tNo given arguments\n");
 		} else {
 			print_argument_types();
+			const gbString append_proc_name = gb_string_make(temporary_allocator(), "append");
+			if(gb_string_are_equal(expr_name, append_proc_name)){
+				error_line("Help: Make sure that you passed, as the first argument, a dynamic array by pointer, like so `append(&some_dynamic_array, ...)`.\n");
+			}
 		}
 
 		if (procs.count == 0) {