math/big: fix comment typo in natdiv.go

[With-Sky]

Comment in line 395:
[x₀ < S, so S - x₀ < 0; drop it]
Should be:
[x₀ < S, so S - x₀ > 0; drop it]

The proof is based on S - x₀ > 0, thus it's a typo of comment.

Fixes #68466

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Patch Set 2:

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Message from Keith Randall:

Patch Set 2: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Patch Set 2: Code-Review+1

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This PR is being closed because golang.org/cl/598855 has been merged.