Grails: remove legacy caveats

Formula/grails.rb

@@ -13,31 +13,8 @@ class Grails < Formula
   end
 
   def caveats; <<-EOS.undent
-    Notes On Upgrading Grails From Versions < 1.3.7
-
-    The directory layout has been changed slightly for versions >= 1.3.7
-    in order to conform with Homebrew conventions for installation of Java
-    jar files.  Please note the following:
-
-    Before upgrading:
-      run 'brew unlink grails' (keeps old version in cellar)
-    or
-      run 'brew rm grails' (deletes old version from cellar)
-
-    and then:
-      run 'brew prune'
-
-    This is to ensure that HOMEBREW_PREFIX is cleaned of references to the
-    old version.
-
-    The Grails home directory for versions < 1.3.7 was in the form:
-      #{HOMEBREW_CELLAR}/grails/1.3.6
-
-    For versions >= 1.3.7, the Grails home directory is in the form:
-      #{libexec}
-
-    If you set the GRAILS_HOME variable explicitly in your shell environment,
-    change its value accordingly.
+    The GRAILS_HOME directory is:
+      #{opt_prefix}/libexec
     EOS
   end
 end