message: FileStorage: use copydoc to add base64 info to constructor
diff: @@ -340,16 +340,9 @@ public:
  CV_WRAP FileStorage();
  /** @overload
  - @param source Name of the file to open or the text string to read the data from. Extension of the
  - file (.xml, .yml/.yaml, or .json) determines its format (XML, YAML or JSON respectively). Also you can
  - append .gz to work with compressed files, for example myHugeMatrix.xml.gz. If both FileStorage::WRITE
  - and FileStorage::MEMORY flags are specified, source is used just to specify the output file format (e.g.
  - mydata.xml, .yml etc.).
  - @param flags Mode of operation. See FileStorage::Mode
  - @param encoding Encoding of the file. Note that UTF-16 XML encoding is not supported currently and
  - you should use 8-bit encoding instead of it.
  + @copydoc open()
  */
  - CV_WRAP FileStorage(const String& source, int flags, const String& encoding=String());
  + CV_WRAP FileStorage(const String& filename, int flags, const String& encoding=String());
  /** @overload */
  FileStorage(CvFileStorage* fs, bool owning=true);
  