message: add wildcard mention
diff: @@ -10,6 +10,9 @@ use tantivy_fst::Regex;
  /// containing a specific term that matches
  /// a regex pattern.
  ///
  +/// Wildcard queries (e.g. ho*se) can be achieved
  +/// by converting them to their regex counterparts.
  +///
  /// ```rust
  /// use tantivy::collector::Count;
  /// use tantivy::query::RegexQuery;
  