Update battery settings page footer string

screenshot: https://screenshot.googleplex.com/4LdASHFSS23Q5NK.png

Bug: 274871896
Fix: 274871896
Test: make SettingsRoboTests
Change-Id: Ia739e5b004755a16fb80d460657bcffcb40404f9
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 197672d..3d8985b 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -5270,7 +5270,7 @@
     <!-- Title for usage time that full charge lasts. [CHAR LIMIT=60] -->
     <string name="battery_full_charge_last">Full charge lasts about</string>
     <!-- Description for text in battery footer. [CHAR LIMIT=NONE] -->
-    <string name="battery_footer_summary">Battery usage data is approximate and can change based on usage.</string>
+    <string name="battery_footer_summary">Remaining battery life is approximate and can change based on usage</string>
     <!-- Title for battery usage amount by this app. [CHAR LIMIT=80] -->
     <string name="battery_detail_power_usage">Battery usage</string>