AGPS: Mention that it's ignored during user-initiated emergency calls

Issue: calyxos#1490
Change-Id: Iab13be99ccd65e0fdabcb67a25d73944ef24556a
diff --git a/res/values/cm_strings.xml b/res/values/cm_strings.xml
index 36272c0..57e7413 100644
--- a/res/values/cm_strings.xml
+++ b/res/values/cm_strings.xml
@@ -82,5 +82,5 @@
     <!-- Location settings screen, setting check box label if Assisted GPS should be enabled -->
     <string name="assisted_gps">Use assisted GPS</string>
     <!-- Location settings screen, setting summary for Assisted GPS switch -->
-    <string name="assisted_gps_summary">Download satellite assistance data from the internet which can greatly improve the GPS startup performance</string>
+    <string name="assisted_gps_summary">Download satellite assistance data from the internet which can greatly improve the GPS startup performance. For emergency calls, assisted GPS is always allowed.</string>
 </resources>