Cleanup comments in xlog compression

Stephen Frost <sfrost@snowman.net>

Commit: a243c55326686b284fbe2c7b70f06d8a022b7dcc
Author: Stephen Frost <sfrost@snowman.net>
Date: 2018-12-06T16:05:39Z
Releases: 12.0
Cleanup comments in xlog compression

Skipping over the "hole" in full page images in the XLOG code was
described as being a form of compression, but this got a bit confusing
since we now have PGLZ-based compression happening, so adjust the
wording to discuss "removing" the "hole" and keeping the talk about
compression to where we're talking about using PGLZ-based compression of
the full page images.

Reviewed-By: Kyotaro Horiguchi
Discussion: https://postgr.es/m/20181127234341.GM3415@tamriel.snowman.net

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