Fix GiST README's explanation of the NSN cross-check.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: bf094372d14bf00f1c04f70f6ec5790f8b2c8801
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2023-09-19T08:53:51Z
Releases: 17.0
Fix GiST README's explanation of the NSN cross-check.

The text got the condition backwards, it's "NSN > LSN", not "NSN < LSN".
While we're at it, expand it a little for clarity.

Reviewed-by: Daniel Gustafsson
Discussion: https://www.postgresql.org/message-id/4cb46e18-e688-524a-0f73-b1f03ed5d6ee@iki.fi

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src/backend/access/gist/README modified +4 −4

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