doc: document "IS NOT DOCUMENT"

Bruce Momjian <bruce@momjian.us>

Commit: b71741b425787644bbf8b8d469622fb315892cb0
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-04-02T20:41:46Z
Releases: 9.4.18
doc:  document "IS NOT DOCUMENT"

Reported-by: scott.ure@caseware.com

Discussion: https://postgr.es/m/152056505045.4963.16783351661813640274@wrigleys.postgresql.org

Author: Euler Taveira

Backpatch-through: 9.3

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doc/src/sgml/func.sgml modified +18 −0