docs for DROP ... IF EXISTS for the following cases:

Andrew Dunstan <andrew@dunslane.net>

Commit: e287fb27a5d2419286cd90cd7ddc1a077325d93f
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2006-06-16T22:27:55Z
Releases: 8.2.0
docs for DROP ... IF EXISTS for the following cases:
  language, tablespace, trigger, rule, opclass, function, aggregate. operator, and cast.

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