drm/i915: Fix kerneldoc parameter markup

drivers/gpu/drm/i915/i915_syncmap.c:92: warning: No description found for parameter 'root'
drivers/gpu/drm/i915/i915_syncmap.c:155: warning: No description found for parameter 'root'
drivers/gpu/drm/i915/i915_syncmap.c:155: warning: No description found for parameter 'id'
drivers/gpu/drm/i915/i915_syncmap.c:155: warning: No description found for parameter 'seqno'
drivers/gpu/drm/i915/i915_syncmap.c:354: warning: No description found for parameter 'root'
drivers/gpu/drm/i915/i915_syncmap.c:354: warning: No description found for parameter 'id'
drivers/gpu/drm/i915/i915_syncmap.c:354: warning: No description found for parameter 'seqno'
drivers/gpu/drm/i915/i915_syncmap.c:396: warning: No description found for parameter 'root'

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180208105449.29880-2-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drivers/gpu/drm/i915/i915_syncmap.c

@@ -86,7 +86,7 @@ struct i915_syncmap {
 
 /**
  * i915_syncmap_init -- initialise the #i915_syncmap
- * @root - pointer to the #i915_syncmap
+ * @root: pointer to the #i915_syncmap
  */
 void i915_syncmap_init(struct i915_syncmap **root)
 {
@@ -139,9 +139,9 @@ static inline bool seqno_later(u32 a, u32 b)
 
 /**
  * i915_syncmap_is_later -- compare against the last know sync point
- * @root - pointer to the #i915_syncmap
- * @id - the context id (other timeline) we are synchronising to
- * @seqno - the sequence number along the other timeline
+ * @root: pointer to the #i915_syncmap
+ * @id: the context id (other timeline) we are synchronising to
+ * @seqno: the sequence number along the other timeline
  *
  * If we have already synchronised this @root timeline with another (@id) then
  * we can omit any repeated or earlier synchronisation requests. If the two
@@ -339,9 +339,9 @@ found:
 
 /**
  * i915_syncmap_set -- mark the most recent syncpoint between contexts
- * @root - pointer to the #i915_syncmap
- * @id - the context id (other timeline) we have synchronised to
- * @seqno - the sequence number along the other timeline
+ * @root: pointer to the #i915_syncmap
+ * @id: the context id (other timeline) we have synchronised to
+ * @seqno: the sequence number along the other timeline
  *
  * When we synchronise this @root timeline with another (@id), we also know
  * that we have synchronized with all previous seqno along that timeline. If
@@ -382,7 +382,7 @@ static void __sync_free(struct i915_syncmap *p)
 
 /**
  * i915_syncmap_free -- free all memory associated with the syncmap
- * @root - pointer to the #i915_syncmap
+ * @root: pointer to the #i915_syncmap
  *
  * Either when the timeline is to be freed and we no longer need the sync
  * point tracking, or when the fences are all known to be signaled and the