[Struts Wiki] Update of "StrutsUpgradeNotes12to13" by WendySmoak

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http://wiki.apache.org/struts/StrutsUpgradeNotes12to13

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  Beginning with Struts 1.3, a servlet container that supports Servlet 2.3 and JSP 1.2 (such as Tomcat 4.x) is required.
  
  == 2 .Packaging ==
- While previously Struts was distributed as a "monolithic" jar, beginning with the 1.3.0 release, many things which were formerly in the "core" have been split out into their own distributions.  You will always need "struts-action-1.3.x.jar", and you may need one or more of the following:
+ While previously Struts was distributed as a "monolithic" jar, beginning with the 1.3.0 release, many things which were formerly in the "core" have been split out into their own distributions.  You will always need "struts-core-1.3.x.jar", and you may need one or more of the following:
  
   * struts-taglib-1.3.x.jar (if you want to use the JSP tag libraries, except for the Tiles tag library)
   * struts-el-1.3.x.jar (in addition to struts-taglib) if you want to use the JSTL expression language
@@ -23, +23 @@

  [http://jakarta.apache.org/commons/chain/ Commons Chain] version 1.0. - remember to deploy the Chain jar
  
  === 3.2 File Upload 1.1 ===
- Struts 1.3 now depends on 
+ Struts 1.3 has an ''optional'' dependency on 
  [http://jakarta.apache.org/commons/fileupload/ Commons FileUpload] version 1.1 (previously was version 1.0). As well as needing to upgrade the !FileUpload jar you will now also need the 
  [http://jakarta.apache.org/commons/io/ Commons IO] Version 1.1 jar.
  
@@ -42, +42 @@

     * If you change the doctype you will have to change the deprecated ''arg0-arg3'' elements to ''arg'' elements.
  
  
-  * You must upgrade to the new version of validator-rules.xml.  This file is included in struts-action.jar, so the easiest way to upgrade is to delete any copies you may have in your application and use the following Validator Plugin configuration:
+  * You must upgrade to the new version of validator-rules.xml.  This file is included in struts-core-1.3.x.jar, so the easiest way to upgrade is to delete any copies you may have in your application and use the following Validator Plugin configuration:
  
  {{{
    <plug-in className="org.apache.struts.validator.ValidatorPlugIn">