[Merged by Bors] - feat(NumberTheory/SiegelsLemma): replace Fin m and Fin n with Fintype α and Fintype β

[fbarroero]

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[github-actions]

PR summary 5c1b12fd69

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

[riccardobrasca]

This is strictly more general than the current version, thanks!

bors d+

[mathlib-bors]

✌️ fbarroero can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

[fbarroero]

This is strictly more general than the current version, thanks!

bors d+

Thanks!

bors r+

[fbarroero]

✌️ fbarroero can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

bors r+

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[mathlib-bors]

Pull request successfully merged into master.

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