[Solr Wiki] Update of "UpdateCSV" by ErikHatcher

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The "UpdateCSV" page has been changed by ErikHatcher:
http://wiki.apache.org/solr/UpdateCSV?action=diff&rev1=15&rev2=16

Comment:
Added literal. from SOLR-1032

  === keepEmpty ===
  Keep and index empty (zero length) field values.  This may be specified globally, or on a per-field basis.  The default is {{{keepEmpty=false}}}.
  
+ === literal ===
+ <!> [[Solr4.0]] Adds fixed field name/value to all documents.
+ 
+ Example: Adds a "datasource" field with value equal to "products" for every document indexed from the CSV
+ {{{
+ literal.datasource=products
+ }}}
+ 
  === map ===
  Specifies a mapping between one value and another.  The string on the LHS of the colon will be replaced with the string on the RHS.  This parameter can be specified globally or on a per-field basis.