Clarify process_dex2oat_label description

Bug: 21898104
Change-Id: I264f784db761ac51a1dde51f189fb017b7d378b1
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 6169fc9..faea589 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -4247,7 +4247,7 @@
     <string name="process_kernel_label">Android OS</string>
     <!-- Label for mediaserver process in battery usage -->
     <string name="process_mediaserver_label">Mediaserver</string>
-    <!-- Label for dex2oat process used for app optimization in battery usage -->
+    <!-- Label for dex2oat process in battery usage used for the optimization of one or more apps -->
     <string name="process_dex2oat_label">App optimization</string>
 
     <!-- [CHAR_LIMIT=40] Battery saver: Label for feature, title + menu item -->