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Enguerrand ARMINJON 0917d0da66

This PR improve the Flutter documentation about the Textfield.hintText
property. On our e-commerce app, Samsung pass was not working and we
discovered that, after using hintText : Samsung pass autofill was
working perfectly.

Example (that can help) : 
```dart
 TextFormField(
   autofillHints: const <String>[
    // Order is important, username must be first
     AutofillHints.username,
     AutofillHints.email,
   ],
   keyboardType: TextInputType.emailAddress,
   decoration: InputDecoration(
     hintText: "What do you want, it doesn't matter but it's important to use it",
  ),
 ),
 ...
 TextFormField(
   autofillHints: const <String>[AutofillHints.password],    
   obscureText: true,
   keyboardType: TextInputType.visiblePassword,
   decoration: InputDecoration(
     hintText: "What do you want, it doesn't matter but it's important to use it",
   ),
 ),
```

## Pre-launch Checklist

- [X] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [X] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [X] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [X] I signed the [CLA].
- [X] I listed at least one issue that this PR fixes in the description
above.
- [X] I updated/added relevant documentation (doc comments with `///`).
- [X] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [X] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [X] All existing and new tests are passing.

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

Co-authored-by: Enguerrand ARMINJON WINDOWS <enguerrand.arminjon@gmail.com>