drm/ttm: fix kernel-doc typo for @trylock_only

s/tryock_only/trylock_only/

Fixes: da966b82 ("drm/ttm: Provide a generic LRU walker helper")
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240823141110.3431423-1-jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>