Doc: minor clarifications in xindex.sgml.

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

Commit: 64fb645914741ffc3aee646308416c209c6ff06b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-02-04T16:46:28Z
Releases: 11.0
Doc: minor clarifications in xindex.sgml.

I noticed some slightly confusing or out-of-date verbiage here
while working on the window RANGE patch.  Seems worth committing
separately.

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doc/src/sgml/xindex.sgml modified +24 −10

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