There were several typos present here in this document which have been fixed in this PR. Thank you!

Compare with current output at https://github.com/tensorflow/tensorflow/blob/74aa493664e1e93701fedba7db4ae7701963927f/CONTRIBUTING.md#typical-pull-request-workflow--

PiperOrigin-RevId: 521503128

Reverted mermaid flowchart

- Fixed typos
- Fixed broken links

1. Included a mermaid flowchart for PR Workflow.
2. Fixed typos and broken links.
3. Organised the file with new layout for better readability.

Resolves https://github.com/tensorflow/tensorflow/issues/48919.

PiperOrigin-RevId: 380915403
Change-Id: I6b79f15226efcb13d10f05d0fbd0e8cf01c81583

Within the same file, no need to have the URL part.

Add 3 missing "the".

For consistency with the rest of the file's content.

Close #42527

Imported from GitHub PR https://github.com/tensorflow/tensorflow/pull/42501

Fixed typos
Copybara import of the project:

--
0dd22ba9 by Aniket Kumar Singh <aniketks321@gmail.com>:

Update CONTRIBUTING.md

Fixed typos

PiperOrigin-RevId: 327694861
Change-Id: I1b26624ffa041a02ff3d7a88bb3cc4e02993b836

Fixed typos

PiperOrigin-RevId: 302993272
Change-Id: Ie667bfa17f683dfb2e174d373e745f512f72124d

In CONTRIBUTING.md, pylint style definition file was downloaded from
the web before used for style checking. However, as the
style definition file `tensorflow/tools/ci_build/pylintrc`
is really part of the repo, the download could be avoided with just
the following:
```
pylint --rcfile=tensorflow/tools/ci_build/pylintrc myfile.py
```

This PR updates CONTRIBUTING.md
Signed-off-by: NYong Tang <yong.tang.github@outlook.com>

This intends to reduce duplication and ensure that new informations added
to the developer guide (like the recent testing good practice) are not
missed by new contributors.

PiperOrigin-RevId: 258650672

Co-Authored-By: NMehdi Amini <joker.eph@gmail.com>