Fix : oppia#4793 (oppia#5092)

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## Explanation
Fixes oppia#4793 
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https://github.com/oppia/oppia-android/assets/109658545/e542f6fc-02fc-43de-a413-93fe1e49bc04


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app/src/main/res/values/strings.xml

@@ -453,7 +453,7 @@
   <string name="no_new_hint_available">No new hint available</string>
   <string name="show_hints_and_solution">Show hints and solution</string>
   <string name="hint_list_item_number">Hint %s</string>
-  <string name="hints_andSolution_close_icon_description">Navigate up</string>
+  <string name="hints_andSolution_close_icon_description">Close</string>
   <string name="hints_toolbar_title">Hints</string>
   <string name="show_solution">Show solution</string>
   <string name="reveal_solution">Show Solution</string>