Update deep-linking.md - Fix Declare Association between website and …

[BismarkCodes]

…intent-filters external documentation url

The current link redirects to https://support.google.com/android/search?q=open+by+default#web-assoc which does not provide the intended document. I changed it to the actual url which is 'https://developer.android.com/training/app-links/verify-android-applinks#web-assoc'

READ ME PLEASE

TL;DR: Make sure to add your changes to versioned docs

Thanks for opening a PR!

The docs cover several versions of react-navigation, and in some cases there are several files (for version 1, version 2 and etc.) that all describe a single page of the docs (eg. "Getting Started").

Please make sure that the edit you're making in docs/file-you-edited.md is also included in the file for the correct version, eg. /versioned_docs/version-3.x/file-you-edited.md for version 3. If such file doesn't exist, please create it. :+1:

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[mattpmoreno]

@BismarkCodes is your update still true? When I look up instructions on how to add association, Google tells me to use Google Play Store -> App -> Setup -> Advanced Settings -> App Indexing -> Verified Websites. Not pushing back on your PR, just trying to figure out what the right way to do this is... Thanks!