Documentation/admin-guide: fix typo and comment in cscope example

Documentation/admin-guide: fix typo and comment in cscope example

This patch updates the Linux documentation for cscope, fixing two issues:
1. Corrects the typo in the command line:
       c"scope -d -p10  ->  cscope -d -p10
2. Fixes the related documentation comment for clarity and correctness:
       cscope by default cscope.out database.
       ->
       cscope by default uses the cscope.out database.

Signed-off-by: Jiakai Xu <jiakaiPeanut@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20251119065727.3500015-1-jiakaiPeanut@gmail.com>