drm: Fix kerneldoc for DRM_MODE_PROP_IMMUTABLE

Noticed this while browsing the docs.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180713153444.95466-1-seanpaul@chromium.org

include/drm/drm_property.h

@@ -147,10 +147,10 @@ struct drm_property {
 	 *     properties are not exposed to legacy userspace.
 	 *
 	 * DRM_MODE_PROP_IMMUTABLE
-	 *     Set for properties where userspace cannot be changed by
+	 *     Set for properties whose values cannot be changed by
 	 *     userspace. The kernel is allowed to update the value of these
 	 *     properties. This is generally used to expose probe state to
-	 *     usersapce, e.g. the EDID, or the connector path property on DP
+	 *     userspace, e.g. the EDID, or the connector path property on DP
 	 *     MST sinks.
 	 */
 	uint32_t flags;