docs(rtk-query): Fix grammatical error in part 7

Corrects an incomplete sentence structure in the "Redux Essentials,
Part 7:RTK Query Basics" documentation page. The original sentence was
missing the relative pronoun "that" or a suitable participle, making it
grammatically incorrect and slightly confusing.

Author: BonaventureCJ

docs/tutorials/essentials/part-7-rtk-query-basics.md

@@ -115,7 +115,7 @@ import { createApi } from '@reduxjs/toolkit/query/react'
 
 RTK Query primarily consists of two APIs:
 
-- [`createApi()`](https://redux-toolkit.js.org/rtk-query/api/createApi): The core of RTK Query's functionality. It allows you to define a set of endpoints describe how to retrieve data from a series of endpoints, including configuration of how to fetch and transform that data. In most cases, you should use this once per app, with "one API slice per base URL" as a rule of thumb.
+- [`createApi()`](https://redux-toolkit.js.org/rtk-query/api/createApi): The core of RTK Query's functionality. It allows you to define a set of endpoints that describe how to retrieve data from a series of endpoints, including configuration of how to fetch and transform that data. In most cases, you should use this once per app, with "one API slice per base URL" as a rule of thumb.
 - [`fetchBaseQuery()`](https://redux-toolkit.js.org/rtk-query/api/fetchBaseQuery): A small wrapper around [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) that aims to simplify HTTP requests. RTK Query can be used to cache the result of _any_ async request, but since HTTP requests are the most common use case, `fetchBaseQuery` provides HTTP support out of the box.
 
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