Fix missing documentation and typos in free_algebra_letterplace.pyx

[Kushagra0811]

This PR fixes missing documentation and coverage warnings in src/sage/algebras/letterplace/free_algebra_letterplace.pyx.

Specifically:

• Added missing docstring and EXAMPLES for generator_degrees.
• Added docstrings and TESTS for __init__ and __cinit__ (indirect doctests).
• Fixed grammatical typos in degbound and set_degbound ("In order to avoid we get..." -> "To avoid getting...").

📝 Checklist

• The title is concise and informative.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation and checked the documentation preview.

[cxzhong]

@roed314 Workflows please

[roed314]

I will, but can't right now since I'm not at a computer for most of the day

…

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[Kushagra0811]

Hi! This is my first contribution to SageMath so I'm still learning the workflow. I checked the failed logs for the Build documentation / doc -html and there seems to be a [Errno 28] No space left on device Error, which doesn't look like an issue in the code, could it be fixed by restarting the workflow?

[roed314]

Could be; I restarted it.

[cxzhong]

Hi! This is my first contribution to SageMath so I'm still learning the workflow. I checked the failed logs for the Build documentation / doc -html and there seems to be a [Errno 28] No space left on device Error, which doesn't look like an issue in the code, could it be fixed by restarting the workflow?

We are investigating this. Do not care about it.

[cxzhong]

Seems CI agrees that

[cxzhong]

LGTM. Thank you