message: Minor change in docs
diff: @@ -43,7 +43,7 @@ struct WilliamPrcRVisitor;
  The result is a vector of values with same number of items as the given columns. The first roll_count items, in the result, will be NAN.<BR>
  Williams %R, also known as the Williams Percent Range, is a type of momentum indicator that moves between 0 and -100 and measures overbought and oversold levels. The Williams %R may be used to find entry and exit points in the market.<BR>
  <PRE>
  - explicit WilliamPrcRVisitor(size_t roll_count);
  + explicit WilliamPrcRVisitor(size_t roll_count = 14);
  </PRE>
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