[Solr Wiki] Update of "FAQ" by PeterWolanin

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The following page has been changed by PeterWolanin:
http://wiki.apache.org/solr/FAQ

The comment on the change is:
SOLR-226 added support for dynamic fields as copyField destination.

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  == How do I use copyField with wildcards? ==
  
- The `<copyField>` directive allows wildcards in the source, so that several fields can be copied into one destination field without having to specify them all individually.  All dest fields must be full field names -- not wildcard expressions. A common use case is something like:
+ The `<copyField>` directive allows wildcards in the source, so that several fields can be copied into one destination field without having to specify them all individually.  The dest field may by a full field name, or a wildcard expression. A common use case is something like:
  
  {{{
     <copyField source="*_t"  dest="text" />