C comments: improve description of relfilenode uniqueness

Bruce Momjian <bruce@momjian.us>

Commit: 5024044a204ea4158c9223b28a31f60afc1e759f
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-03-08T17:20:30Z
Releases: 9.4.0
C comments: improve description of relfilenode uniqueness

Report by Antonin Houska

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