Remove config_setting from the list of alias exceptions.

Not only is this allowed, but it happens in a few places in the codebase -
particularly in the new config_setting_and and config_setting_or!

RELNOTES: None.
PiperOrigin-RevId: 226334866
diff --git a/src/main/java/com/google/devtools/build/lib/rules/Alias.java b/src/main/java/com/google/devtools/build/lib/rules/Alias.java
index ed8d164..9170122 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/Alias.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/Alias.java
@@ -94,8 +94,8 @@
 </p>
 
 <p>
-  Aliasing only works for "regular" targets. In particular, <code>package_group</code>,
-    <code>config_setting</code> and <code>test_suite</code> rules cannot be aliased.
+  Aliasing only works for "regular" targets. In particular, <code>package_group</code>
+    and <code>test_suite</code> rules cannot be aliased.
 </p>
 
 <p>