[Wrethis]

This adds constructor signatures for FY5253 and FY5253Quarter to doc/source/signature_overrides.py, as part of #70457.

FY5253 uses weekday=0 and startingMonth=1 as defaults, but the existing "weekday" and "startingMonth" entries default to None (used by Week and the quarter offsets). So I added separate fy_weekday and fy_startingMonth entries that keep the real parameter names but have the right defaults.

I checked that the signatures match the constructors by running apply_signature_overrides() locally.

Note: #71797 renames startingMonth on FY5253, so whichever PR is merged second will need a small update.

I used Claude Code (Claude Opus 5.5, effort: medium) to help understand the issue. I reviewed and tested it myself.

• xref DOC: Fix docs signature for various offset constructors #70457

• Tests added and passed if fixing a bug or adding a new feature

• All code checks passed.

• Added type annotations to new arguments/methods/functions.

• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

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  Check exactly one of the following, per the automated contributions policy:

• I did not use AI to develop this pull request.

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