Hide colorSwitchThumbNormal from docs

BUG: 30702765
Change-Id: I10255b7adc2531bb935e9f77db0ea9dadfcbf76e
diff --git a/v7/appcompat/res-public/values/public_attrs.xml b/v7/appcompat/res-public/values/public_attrs.xml
index f61ca8e..6ffa864 100644
--- a/v7/appcompat/res-public/values/public_attrs.xml
+++ b/v7/appcompat/res-public/values/public_attrs.xml
@@ -86,7 +86,6 @@
      <public type="attr" name="colorControlNormal"/>
      <public type="attr" name="colorPrimary"/>
      <public type="attr" name="colorPrimaryDark"/>
-     <public type="attr" name="colorSwitchThumbNormal"/>
      <public type="attr" name="commitIcon"/>
      <public type="attr" name="contentInsetEnd"/>
      <public type="attr" name="contentInsetEndWithActions"/>