docs: Clarify --with-segsize-blocks documentation

Andres Freund <andres@anarazel.de>

Commit: a2c2fbf740fcfdf75b76d589b8e85c1cdf725a46
Author: Andres Freund <andres@anarazel.de>
Date: 2023-09-25T17:36:04Z
Releases: 17.0
docs: Clarify --with-segsize-blocks documentation

Without the added "relation" it's not immediately clear that the option
relates to the relation segment size and not e.g. the WAL segment size.

The option was added in d3b111e32.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/837536.1695348498@sss.pgh.pa.us
Backpatch: 16-

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doc/src/sgml/installation.sgml modified +2 −2

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