Ensure 2.1.0 features are in docs

[EskiMojo14]

some of the features added in v2.1.0 are currently undocumented - need adding to docs

[riqts]

Would love to jump in and document these.

Do you know off the top of your head which of these changes from 2.1.0 post have/have not been updated?

I am happy to do my own research on the actual workings and what changed for the documentation update, but a small nudge in the right direction might be useful.

• adds withTypes methods to listenerMiddleware and createDraftSafeSelector
• adds a skipPollingIfUnfocused option to RTK Query
• adds the ability to customise the createSelector instance used by RTK Query
• reworks slice selector logic to avoid depending on this value (does this need documentation on the site?)
• fixes the order and inference of create.asyncThunk type parameters
• fixes requirements for meta fields returned from queryFns
• marks promises that will never reject as safe, in preparation for Enhancement: [no-floating-promises] add an 'allowForKnownSafePromises' option typescript-eslint/typescript-eslint#7008

[EskiMojo14]

the last four don't need documentation, they're essentially bug fixes.

as you've noted, skipPollingIfUnfocused and createSelector for RTKQ are now documented, so it should just be making sure .withTypes is documented :)