Correct capitaliztion of "wi-fi" to "Wi-Fi".

Change-Id: I4ce0898dbae20ac26d1e12db9e9aa094c537e230
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 45851f9..944eff6 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -144,15 +144,15 @@
     <!-- The "label" of the in-call Notification for an ongoing call. [CHAR LIMIT=60] -->
     <string name="notification_ongoing_call">Ongoing call</string>
     <!-- The "label" of the in-call Notification for an ongoing call, which is being made over
-         wi-fi. [CHAR LIMIT=60] -->
-    <string name="notification_ongoing_call_wifi">Ongoing wi-fi call</string>
+         Wi-Fi. [CHAR LIMIT=60] -->
+    <string name="notification_ongoing_call_wifi">Ongoing Wi-Fi call</string>
     <!-- The "label" of the in-call Notification for a call that's on hold -->
     <string name="notification_on_hold">On hold</string>
     <!-- The "label" of the in-call Notification for an incoming ringing call. [CHAR LIMIT=60] -->
     <string name="notification_incoming_call">Incoming call</string>
     <!-- The "label" of the in-call Notification for an incoming ringing call,
-         which is being made over wi-fi. [CHAR LIMIT=60] -->
-    <string name="notification_incoming_call_wifi">Incoming wi-fi call</string>
+         which is being made over Wi-Fi. [CHAR LIMIT=60] -->
+    <string name="notification_incoming_call_wifi">Incoming Wi-Fi call</string>
     <!-- The "label" of the in-call Notification for an incoming ringing video call. -->
     <string name="notification_incoming_video_call">Incoming video call</string>
     <!-- The "label" of the in-call Notification for upgrading an existing call to a video call. -->