Schema field number documentation

[bzablocki]

As reported in #30273, the documentation of the SchemaFieldNumber annotation has an error. This PR fixes this error.

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[bzablocki]

Unfortunately it seems like it'd be backwards incompatible to actually make it take an int, right?

Yes, I can't think of an elegant way to make a backwards compatible version of this annotation that takes an int.

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[bzablocki]

Hi @robertwb, I believe the failing tests are just flaky - could you rerun the tests? Can we merge if they pass?