drm/i915/scatterlist: fix kernel-doc

Can't document function pointer members as if they are functions.

drivers/gpu/drm/i915/i915_scatterlist.h:160: warning: Incorrect use of kernel-doc format:          * release() - Free the memory of the struct i915_refct_sgt
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/a0c099707ec4f1911b14b0f286848a298b2b29e0.1683041799.git.jani.nikula@intel.com

drivers/gpu/drm/i915/i915_scatterlist.h

@@ -157,8 +157,7 @@ bool i915_sg_trim(struct sg_table *orig_st);
  */
 struct i915_refct_sgt_ops {
 	/**
-	 * release() - Free the memory of the struct i915_refct_sgt
-	 * @ref: struct kref that is embedded in the struct i915_refct_sgt
+	 * @release: Free the memory of the struct i915_refct_sgt
 	 */
 	void (*release)(struct kref *ref);
 };