Updated documentation with direct access to Android context

[debanjanbasu]

Changes

#1868

@fzyzcjy - adding in the documentation, for the help of others when they might require.

Checklist

• An issue to be fixed by this PR is listed above.
• New tests are added to ensure new features are working. Please refer to this page to see how to add a test.
• ./frb_internal precommit --mode slow (or fast) is run (it internal runs code generator, does auto formatting, etc).
• If this PR adds/changes features, documentations (in the ./website folder) are updated.
• CI is passing. Please refer to this page to see how to solve a failed CI.

Remark for PR creator

• ./frb_internal --help shows utilities for development.
• If fzyzcjy does not reply for a few days, maybe he just did not see it, so please ping him.

[welcome]

Hi! Thanks for opening this pull request! 😄

[fzyzcjy]

Good job! I will merge and then slighly move it (e.g. maybe to a separate doc)

[fzyzcjy]

@all-contributors please add @debanjanbasu for doc

[allcontributors]

@fzyzcjy

I've put up a pull request to add @debanjanbasu! 🎉

[welcome]

Hi! Congrats on merging your first pull request! 🎉