Merge pull request #1116 from GotenXiao/fix-truetype-documentation

Fix truetype() documentation

PIL/ImageFont.py

@@ -214,7 +214,7 @@ def truetype(font=None, size=10, index=0, encoding="", filename=None):
 
     This function requires the _imagingft service.
 
-    :param filename: A truetype font file. Under Windows, if the file
+    :param font: A truetype font file. Under Windows, if the file
                      is not found in this filename, the loader also looks in
                      Windows :file:`fonts/` directory.
     :param size: The requested size, in points.
@@ -224,6 +224,7 @@ def truetype(font=None, size=10, index=0, encoding="", filename=None):
                      Symbol), "ADOB" (Adobe Standard), "ADBE" (Adobe Expert),
                      and "armn" (Apple Roman). See the FreeType documentation
                      for more information.
+    :param filename: Deprecated. Please use font instead.
     :return: A font object.
     :exception IOError: If the file could not be read.
     """