Docs / optimization : Rephrasing + fix broken code blocks

[LouisJustinTALLOT]

Types of changes

• [x] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Motivation and Context / Related issue

Small changes to make the optimization page of the docs more readable.

Checklist

• [x] The documentation is up-to-date with the changes I made.
• [x] I have read the CONTRIBUTING document and completed the CLA (see CLA).
• [ ] All tests passed, and additional code has been covered with new tests.

[teytaud]

Hello! For the dangerous default value I guess it will be fixed just by a rebase (git rebase). This might even solve the other bug. Can you give it a try ? Have a great day!

[teytaud]

Hello @LouisJustinTALLOT ; maybe just rebase and everything will be fine in the CI ?