[Pig Wiki] Update of "PiggyBank" by AlanGates

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The "PiggyBank" page has been changed by AlanGates.
http://wiki.apache.org/pig/PiggyBank?action=diff&rev1=14&rev2=15

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  <<Anchor(Using_Functions)>>
  
  == Using Functions ==
- To see how to use your own functions in a pig script, please, see the [[http://wiki.apache.org/pig-data/attachments/FrontPage/attachments/plrm.htm|Pig Latin Reference Manual]]. Note that only JAVA functions are supported at this time.
+ To see how to use your own functions in a pig script, please, see the [[http://pig.apache.org/docs/r0.7.0/udf.html|Pig Latin Reference Manual]]. Note that only JAVA functions are supported at this time.
  
  The functions are currently distributed in source form. Users are required to checkout the code and build the package themselves.  No binary distributions or nightly builds are available at this time.
  
  To build a jar file that contains all available user defined functions (UDFs), please follow the steps:
  
-  1. Checkout UDF code: `svn co http://svn.apache.org/repos/asf/hadoop/pig/trunk/contrib/piggybank`
+  1. Checkout UDF code: `svn co http://svn.apache.org/repos/asf/pig/trunk/contrib/piggybank`
   1. Add pig.jar to your ClassPath : `export CLASSPATH=$CLASSPATH:/path/to/pig.jar`
   1. Build the jar file: from `trunk/contrib/piggybank/java` directory run `ant`. This will generate `piggybank.jar` in the same directory.