doc: update guidelines on non-ASCII characters in docs

Bruce Momjian <bruce@momjian.us>

Commit: fb21ed6c38da719149443e78048790c0347e2c9b
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-05-03T18:45:26Z
Releases: 18.0
doc:  update guidelines on non-ASCII characters in docs

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doc/src/sgml/README.non-ASCII modified +5 −4