Merge #10682: Trivial: Move the AreInputsStandard documentation next to its implement...

Merge #10682: Trivial: Move the AreInputsStandard documentation next to its implementation

ca67ddf0b Move the AreInputsStandard documentation next to its implementation (esneider)

Pull request description:

  The documentation (and rationale) for `AreInputsStandard` somehow got separated from its implementation, and creates a bit of confusion: it's in the middle of the file, next to the implementation of `IsStandard`, which actually checks the "standardness" of outputs, not inputs.

Tree-SHA512: 71281cbcbc5a5701cc11e812a3e90669dda3d92dc2176b512b7832d79b08b34307999c984516bb0c56b01db9b03a12ee4755f662efc1158f4e126de5ca421999