[Lucene-hadoop Wiki] Update of "HowToContribute" by DougCutting

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The following page has been changed by DougCutting:
http://wiki.apache.org/lucene-hadoop/HowToContribute

The comment on the change is:
note indentation convention & ask folks to check javadoc

------------------------------------------------------------------------------
  
  But take care about the following points
   * All public classes and methods should have informative [http://java.sun.com/j2se/javadoc/writingdoccomments/ Javadoc comments].
-  * Code should be formatted according to [http://java.sun.com/docs/codeconv/ Sun's conventions].
+  * Code should be formatted according to [http://java.sun.com/docs/codeconv/ Sun's conventions], with one exception:
+   * indent two spaces per level, not four.
   * Contributions should pass existing unit tests.
   * New unit tests should be provided to demonstrate bugs and fixes ([http://www.junit.org]).
  
  === Generating a patch ===
  
+ ==== Unit Tests ====
+ 
  Please make sure that all unit tests succeed before constructing your patch.
- 
- ==== Unit Tests ====
  
  {{{
  > cd hadoop-trunk
@@ -44, +45 @@

  {{{
  BUILD FAILED
  }}}
- please, read carefully the errors messages and check your code.
+ then please examine error messages in {{{build/test}}} and fix things before proceeding.
+ 
+ ==== Javadoc ====
+ 
+ Please also check the javadoc.
+ 
+ {{{
+ > ant javadoc
+ > firefox build/docs/api/index.html
+ }}}
+ 
+ Examine all public classes you've changed to see that documentation is complete and informative.
  
  ==== Creating a patch ====
  Check to see what files you have modified with: