Type of Edit (select all that apply)

Fix grammar, spelling, formatting

Description (optional)

The entry for Math.Abs() located at content/c-sharp/concepts/math-functions/terms/abs/abs.md does not prepend the function name with a period . in the title as all the other entry files do in the same math-functions directory.

For consistency, this should be updated to match other entries.

Suggested edit:

Title: '.Abs()'

I'm happy to update this!

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