Fixed #7534 -- Added a note about TEST_DATABASE_CHARSET in the contribution documentation. Thanks to Peter Melvyn for the suggestion and initial draft. 
Fixed #7534 -- Added a note about TEST_DATABASE_CHARSET in the contribution documentation. Thanks to Peter Melvyn for the suggestion and initial draft. 

git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@7916 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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