drm/radeon/r100: Realign doc header with function 'r100_cs_packet_parse_vline()'

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/radeon/r100.c:1423: warning: expecting prototype for r100_cs_packet_next_vline(). Prototype was for r100_cs_packet_parse_vline() instead

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/r100.c

@@ -1406,7 +1406,7 @@ int r100_cs_parse_packet0(struct radeon_cs_parser *p,
 }
 
 /**
- * r100_cs_packet_next_vline() - parse userspace VLINE packet
+ * r100_cs_packet_parse_vline() - parse userspace VLINE packet
  * @p:		parser structure holding parsing context.
  *
  * Userspace sends a special sequence for VLINE waits.