Fix grammar for 'an X*'

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Yong Bakos <ybakos@humanoriented.com>
diff --git a/unstable/input-method/input-method-unstable-v1.xml b/unstable/input-method/input-method-unstable-v1.xml
index 274eac8..c1b2b59 100644
--- a/unstable/input-method/input-method-unstable-v1.xml
+++ b/unstable/input-method/input-method-unstable-v1.xml
@@ -145,7 +145,7 @@
 	Notify when a key event was sent. Key events should not be used for
 	normal text input operations, which should be done with commit_string,
 	delete_surrounding_text, etc. The key event follows the wl_keyboard key
-	event convention. Sym is a XKB keysym, state a wl_keyboard key_state.
+	event convention. Sym is an XKB keysym, state a wl_keyboard key_state.
       </description>
       <arg name="serial" type="uint" summary="serial of the latest known text input state"/>
       <arg name="time" type="uint"/>
diff --git a/unstable/text-input/text-input-unstable-v1.xml b/unstable/text-input/text-input-unstable-v1.xml
index 1d00a52..d37ffcf 100644
--- a/unstable/text-input/text-input-unstable-v1.xml
+++ b/unstable/text-input/text-input-unstable-v1.xml
@@ -328,7 +328,7 @@
 	Notify when a key event was sent. Key events should not be used
 	for normal text input operations, which should be done with
 	commit_string, delete_surrounding_text, etc. The key event follows
-	the wl_keyboard key event convention. Sym is a XKB keysym, state a
+	the wl_keyboard key event convention. Sym is an XKB keysym, state a
 	wl_keyboard key_state. Modifiers are a mask for effective modifiers
 	(where the modifier indices are set by the modifiers_map event)
       </description>