Add example info dictionary

Xarthisius · Xarthisius · commit 98b5587b9a6e · 2016-12-25T07:53:26.000-06:00
diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
@@ -2456,7 +2456,9 @@ def __init__(self, filename, keep_empty=True, metadata=None):
             when closed.
         metadata : dictionary, optional
             Information dictionary object (see PDF reference section 10.2.1
-            'Document Information Dictionary').
+            'Document Information Dictionary'), e.g.:
+            `{'Creator': 'My software', 'Author': 'Me',
+            'Title': 'Awesome fig'}`
         """
         self._file = PdfFile(filename, metadata=metadata)
         self.keep_empty = keep_empty
