Update a few dream setting strings to ease translation.

Clarify that sleep = asleep and charging as we do in the ui.

Bug: 7564443
Change-Id: Id50938d6d4052fd4223e212125d10f4bfd0c6908
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 97f2af3..42ae4f0 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1775,11 +1775,11 @@
     <string name="wallpaper_settings_fragment_title">Choose wallpaper from</string>
     <!-- Display settings screen, trigger for screen saver options -->
     <string name="screensaver_settings_title">Daydream</string>
-    <!-- Display settings screen, summary fragment for screen saver options, activated on sleep or docked -->
+    <!-- Display settings screen, summary fragment for screen saver options, activated when docked or asleep and charging -->
     <string name="screensaver_settings_summary_either_long">When docked or asleep and charging</string>
-    <!-- Dream settings screen, dialog option, activated on sleep or docked -->
+    <!-- Dream settings screen, dialog option, activated when docked or asleep and charging -->
     <string name="screensaver_settings_summary_either_short">Either</string>
-    <!-- Display settings screen, summary fragment for screen saver options, activated on sleep -->
+    <!-- Display settings screen, summary fragment for screen saver options, activated when asleep and charging -->
     <string name="screensaver_settings_summary_sleep">While charging</string>
     <!-- Display settings screen, summary fragment for screen saver options, activated when docked  -->
     <string name="screensaver_settings_summary_dock">While docked</string>