Fix a comment misspelling which bugs me.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@15011 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/resources/lib/form/textarea.jelly

 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler">
   <st:documentation>
-    &lt;textarea> tag on steroid.
+    &lt;textarea> tag on steroids.
     The textarea will be rendered to fit the content. It also gets the resize handle.
 
     <st:attribute name="field">