Fix #11017: drop unsupported bitwise ops from Saturate docs

[AayushMainali-Github]

Rationale

Saturate's documentation listed bitwise operators (&, |, ^, and the corresponding op-assign forms) among the supported operators, but using them hits static assert(false) in onOverflow.

This removes those operators from the documented lists so the docs only describe what Saturate actually implements. Added tests so that mismatch can't quietly come back.

Feature request or issue tracking

Closes #11017.

Pre-review checklist

• I have performed a self-review of my code.
• If my PR fixes a bug or introduces a new feature, I have added thorough tests.
• If my changes are non-trivial and do not concern a reported issue, I have added a changelog entry.

LLM/AI disclosure

This PR was written with the assistance of an LLM/AI.