Merge pull request Python-Markdown#378 from d0ugal/docs-fix

Correct the documentation for the slugify function

Author: waylan

docs/extensions/toc.txt

@@ -62,7 +62,7 @@ The following options are provided to configure the output:
 
  >>> text = '''
  # Header 1
- 
+
  ## Header 2
  '''
  >>> md = markdown.Markdown(extensions=['markdown.extensions.toc'])
@@ -71,9 +71,10 @@ The following options are provided to configure the output:
 
 * **`slugify`**:
  Callable to generate anchors based on header text. Defaults to a built in
- `slugify` method. The callable must accept one argument which contains the
- text content of the header and return a string which will be used as the
- anchor text.
+ `slugify` method. The callable must accept two arguments, the first
+ contains the text content of the header and the second contains the
+ separator. It should then return a string which will be used as the anchor
+ text.
 
 * **`title`**:
  Title to insert in the Table of Contents' `<div>`. Defaults to `None`.