Fix regex for keyword arguments (#17)

Author: Bibo-Joshi

sphinx_paramlinks/sphinx_paramlinks.py

@@ -101,7 +101,7 @@ def secondary_cvt(m):
  paramname,
  )
 
- line = re.sub(r"^:(kwarg|param) ([^:]+? )?([^:]+?):", cvt, line)
+ line = re.sub(r"^:(keyword|param) ([^:]+? )?([^:]+?):", cvt, line)
  line = re.sub(r"^:(kwtype|type) ([^:]+? )?([^:]+?):", secondary_cvt, line)
  return line