docs: fix Realtime docstring wording (#3535)

Non-functional changes only:
- Fixed minor spelling mistakes in comments
- Corrected typos in user-facing strings
- No variables, logic, or functional code was modified.

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## Changes being requested
Integrate the typo-fixes.

## Additional context & links
None.

Signed-off-by: Marcel Petrick <mail@marcelpetrick.it>
Co-authored-by: Marcus Wood <marcuswood@openai.com>