check-docs: do not expect guide pages to correspond to commands

When we want to see what commands are listed in `command-list.txt` but
not installed, we currently include lines that refer to guides, e.g.
`gitattributes` or `gitcli`.

Let's not include those lines, as they are not referring to commands.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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