[Solr Wiki] Trivial Update of "ExtendedDisMax" by JanHoydahl

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The "ExtendedDisMax" page has been changed by JanHoydahl:
http://wiki.apache.org/solr/ExtendedDisMax?action=diff&rev1=4&rev2=5

  === uf (User Fields) ===
  Specifies which schema fields the end user shall be allowed to query for explicitly. This parameter supports wildcards.
  
- The default is to allow all fields, equivalent to {{{&uf=*}}}. To allow only title field, use {{{&uf=title}}}, to allow title and all fields ending with _s, use {{{&uf=title *_s}}}. To allow all fields except title, use {{{&uf=* -title}}}
+ The default is to allow all fields, equivalent to {{{&uf=*}}}. To allow only title field, use {{{&uf=title}}}, to allow title and all fields ending with _s, use {{{&uf=title *_s}}}. To allow all fields except title, use {{{&uf=* -title}}}. To disallow all fielded searches, use {{{&uf=-*}}}.
  
  == Examples ==
  /!\ :TODO: /!\ cleanup and expand examples