drm/kms-core: Use recommened kerneldoc for struct member refs

I just learned that &struct_name.member_name works and looks pretty
even. It doesn't (yet) link to the member directly though, which would
be really good for big structures or vfunc tables (where the
per-member kerneldoc tends to be long).

Also some minor drive-by polish where it makes sense, I read a lot
of docs ...

v2: Review from Eric.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170125062657.19270-4-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_property.c

@@ -42,8 +42,8 @@
  * drm_object_attach_property().
  *
  * Property values are only 64bit. To support bigger piles of data (like gamma
- * tables, color correction matrizes or large structures) a property can instead
- * point at a &drm_property_blob with that additional data
+ * tables, color correction matrices or large structures) a property can instead
+ * point at a &drm_property_blob with that additional data.
  *
  * Properties are defined by their symbolic name, userspace must keep a
  * per-object mapping from those names to the property ID used in the atomic