[Solr Wiki] Update of "HackingSolr" by PeterWolanin

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The "HackingSolr" page has been changed by PeterWolanin:
http://wiki.apache.org/solr/HackingSolr?action=diff&rev1=12&rev2=13

  
  == Solr Plugins ==
  
- The first thing to know if you are interested in hacking and customizing Solr, is that you may not need to customize the source at all.  Solr has a fairly extensive number of [[SolrPlugins|Plugin Hooks]] that allow you to add custom functionality for a variety of purposes by developing against some simple APIs, and then use your plugins by placing your jar in a special "lib" directory and refering to them by name in your configuration file.
+ The first thing to know if you are interested in hacking and customizing Solr, is that you may not need to customize the source at all.  Solr has a fairly extensive number of [[SolrPlugins|Plugin Hooks]] that allow you to add custom functionality for a variety of purposes by developing against some simple APIs, and then use your plugins by placing your jar in a special "lib" directory and referring to them by name in your configuration file.
+ 
+ <!> [[Solr3.4]] Note that the ant build.xml files changed in Solr 3.4+, so these instructions would need to be altered for earlier versions.
  
  If you want to know how to add a custom plugin and let the plugin replace the web.xml. Create your plugin similar the existing plugins in the contrib directory. 
  Create a build.xml file and add this to the build.xml file. You will need to change the build.xml to fit your needs but this build.xml is showing you post-compile executions.
- What it is suposed to do is to replace the web.xml file with a custom-web.xml file and to place a compiled jar file from the plugin in to the lib directory so that solr will include it in the solr.war file.
+ What it is supposed to do is to replace the web.xml file with a custom-web.xml file and to place a compiled jar file from the plugin in to the lib directory so that solr will include it in the solr.war file.
  
  {{{
  <?xml version="1.0"?>