Adjust isLoading/isFetching explanation

[phryneas]

Triggered by #1339

@Shrugsy can you give this a read-over if I'm making sense?

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[github-actions]

size-limit report 📦

Path	Size
1. entry point: @reduxjs/toolkit (cjs.production.min.js)	12.21 KB (0%)
1. entry point: @reduxjs/toolkit (esm.js)	10.21 KB (0%)
1. entry point: @reduxjs/toolkit/query (cjs.production.min.js)	20.31 KB (0%)
1. entry point: @reduxjs/toolkit/query (esm.js)	17.35 KB (0%)
1. entry point: @reduxjs/toolkit/query/react (cjs.production.min.js)	22.18 KB (0%)
1. entry point: @reduxjs/toolkit/query/react (esm.js)	19.79 KB (0%)
2. entry point: @reduxjs/toolkit (without dependencies) (cjs.production.min.js)	5.55 KB (0%)
2. entry point: @reduxjs/toolkit (without dependencies) (esm.js)	5.53 KB (0%)
2. entry point: @reduxjs/toolkit/query (without dependencies) (cjs.production.min.js)	9.19 KB (0%)
2. entry point: @reduxjs/toolkit/query (without dependencies) (esm.js)	9.56 KB (0%)
2. entry point: @reduxjs/toolkit/query/react (without dependencies) (cjs.production.min.js)	2.36 KB (0%)
2. entry point: @reduxjs/toolkit/query/react (without dependencies) (esm.js)	2.21 KB (0%)
3. createSlice (esm.js)	5.15 KB (0%)
3. createEntityAdapter (esm.js)	5.82 KB (0%)
3. configureStore (esm.js)	5.83 KB (0%)
3. createApi (esm.js)	15.64 KB (0%)
3. createApi (react) (esm.js)	18.02 KB (0%)
3. fetchBaseQuery (esm.js)	10.91 KB (0%)
3. setupListeners (esm.js)	9.78 KB (0%)
3. ApiProvider (esm.js)	16.96 KB (0%)

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This pull request is automatically built and testable in CodeSandbox.

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Latest deployment of this branch, based on commit 14f758a:

Sandbox	Source
Vanilla	Configuration
Vanilla Typescript	Configuration
rsk-github-issues-example	Configuration
@examples-query-react/basic	Configuration
@examples-query-react/advanced	Configuration

[agusterodin]

This looks much clearer to me 👍

[Shrugsy]

@phryneas Looks good to me 👍