docs: path-lookup: fix HTML entity mojibake

Two cases of "<" somehow turned into "&lt;". I noticed it on
<https://www.kernel.org/doc/html/latest/filesystems/path-lookup.html

>.

I've verified that the HTML output is correct with this patch.

Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Link: https://lore.kernel.org/r/20200727114527.23944-1-vegard.nossum@oracle.com


Signed-off-by: Jonathan Corbet <corbet@lwn.net>