drm/doc: Update styleguide

The new cool is &struct foo (kernel-doc now copes with linebreaks),
and structure members should be referenced using &foo.bar.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1483044517-5770-8-git-send-email-daniel.vetter@ffwll.ch

Documentation/gpu/introduction.rst

@@ -23,13 +23,12 @@ For consistency this documentation uses American English. Abbreviations
 are written as all-uppercase, for example: DRM, KMS, IOCTL, CRTC, and so
 on. To aid in reading, documentations make full use of the markup
 characters kerneldoc provides: @parameter for function parameters,
-@member for structure members, &structure to reference structures and
-function() for functions. These all get automatically hyperlinked if
-kerneldoc for the referenced objects exists. When referencing entries in
-function vtables please use ->vfunc(). Note that kerneldoc does not
-support referencing struct members directly, so please add a reference
-to the vtable struct somewhere in the same paragraph or at least
-section.
+@member for structure members (within the same structure), &struct structure to
+reference structures and function() for functions. These all get automatically
+hyperlinked if kerneldoc for the referenced objects exists. When referencing
+entries in function vtables (and structure members in general) please use
+&vtable_name.vfunc. Unfortunately this does not yet yield a direct link to the
+member, only the structure.
 
 Except in special situations (to separate locked from unlocked variants)
 locking requirements for functions aren't documented in the kerneldoc.