docs: kdoc_parser: fix the default_value logic for variables

docs: kdoc_parser: fix the default_value logic for variables

The indentation is wrong for the second regex, which causes
problems on variables with defaults.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <681f18338abd6ae33cb9c15d72bb31a1cba75a9a.1772469446.git.mchehab+huawei@kernel.org>