[Solr Wiki] Update of "FieldOptionsByUseCase" by HossMan

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The following page has been changed by HossMan:
http://wiki.apache.org/solr/FieldOptionsByUseCase

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  Here is a summary of available options on a field, broken down by use case.  A `true` or `false` indicates that the option must be set to the given value for the use case to function correctly.  
+ 
+ /!\ :TODO: /!\ why are some options bold? .. should we use font style (bold/itallics) to indicate when something is recomended, vs absolutly neccessary?
  
  || use case || '''indexed''' || '''stored''' || '''multiValued''' || '''omitNorms''' || '''termVectors''' || '''termPositions''' ||
  || search within field || `true` || || || || || ||
  || retrieve contents || || `true` || || || || ||
  || use as unique key || `true` || || || || || ||
+ || sort on field || `true` || || `false` || `true` (not neccessary but recomended) || || ||
  || use field boosts || || || || `false` || || ||
  || document boosts affect searches within field || || || || `false` || || ||
  || highlighting || `true` || `true` || || || (optional) || '''`true`''' (if `termVectors=true`) ||