Improve request method documentation

[fabiendem]

Summary

The request method takes an optional rationale parameter.

This parameter is read on Android only:

react-native-permissions/src/methods.android.ts

Line 36 in 6cd97d5

async function request(permission: Permission, rationale?: Rationale): Promise<PermissionStatus> {

It is not read on iOS:

react-native-permissions/src/methods.ios.ts

Line 41 in 6cd97d5

async function request(permission: Permission): Promise<PermissionStatus> {

Neither Windows:

react-native-permissions/src/methods.windows.ts

Line 26 in 6cd97d5

function request(permission: Permission): Promise<PermissionStatus> {

This PR tweaks the documentation to make it clear that the Rationale is only useful on Android.

Happy to tweak the wording if needed.

Test Plan

No test plan, see updated README.

What's required for testing (prerequisites)?

What are the steps to test it (after prerequisites)?

Compatibility

OS	Implemented
iOS	✅
Android	✅

Checklist

• [] I have tested this on a device and a simulator
• I added the documentation in README.md
• [] I added a sample use of the API in the example project (example/App.tsx)

[zoontek]

@fabiendem Hi 👋 Thanks for the contribution!

I think having:

Note that the rationale parameter is only available and used on Android.

Will be more clear. No need to mention iOS here since rationales != prompt texts. What do you think?
PS: Don't forget to run prettier on the markdown or to remove the trailing spaces 🙂

[fabiendem]

Hi @zoontek !
No probs, I have tweaked the wording there.
Format shouuuuld be ok now.

[zoontek]

Yep, it's perfect, thanks!