Document pltcl's return_null command.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: c8b5598a116d2d6079f941bcfce7a052f573f5bc
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-04-30T22:22:34Z
Releases: 7.1.1
Document pltcl's return_null command.

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doc/src/sgml/pltcl.sgml modified +10 −3