Update education strings on A11y 'Time to read' UI

Correction to 'Time to read' UI education strings.

Bug: 119283926
Test: atest AccessibilityTimeoutControllerTest
Test: make RunSettingsRoboTests
Change-Id: I52d0902a2151252803ee694f678aeebbce0b3151
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 7bd9950..7511dbb 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -4724,7 +4724,7 @@
     <!-- Title for accessibility preference to accessibility timeout. [CHAR LIMIT=35] -->
     <string name="accessibility_control_timeout_preference_title">Time to take action</string>
     <!-- Descriptive text for accessibility preference to accessibility content timeout. [CHAR LIMIT=NONE] -->
-    <string name="accessibility_content_timeout_preference_summary">Choose how much time you want to read and take action on messages that automatically go away.\n\nSupport for this setting is up to each app.</string>
+    <string name="accessibility_content_timeout_preference_summary">Choose how long to show messages that you need to read, but are visible only temporarily.\n\nNot all apps support this setting.</string>
     <!-- Descriptive text for accessibility preference to accessibility control timeout. [CHAR LIMIT=NONE] -->
     <string name="accessibility_control_timeout_preference_summary">Choose how long to show messages that ask you to take action, but are visible only temporarily.\n\nNot all apps support this setting.</string>