[Adaptive][Side Sheet] Updated close sheet button content description in catalog.

PiperOrigin-RevId: 494211768
(cherry picked from commit 7096161)

Author: afohrman

catalog/java/io/material/catalog/sidesheet/res/values/strings.xml

@@ -69,7 +69,7 @@
   </string>
 
   <string name="cat_sidesheet_close_button_content_desc" description="Content description for the button to hide the side sheet. [CHAR_LIMIT=NONE]">
-    Close sheet button
+    Close sheet
   </string>
 
   <string name="cat_sidesheet_filler_text" translatable="false">