ignore url for doc link check (#3929)

Author: bjlittle

docs/iris/src/conf.py

@@ -263,6 +263,7 @@ def autolog(message):
 linkcheck_ignore = [
     "http://cfconventions.org",
     "http://code.google.com/p/msysgit/downloads/list",
+    "http://effbot.org",
     "https://github.com",
     "http://www.personal.psu.edu/cab38/ColorBrewer/ColorBrewer_updates.html",
     "http://schacon.github.com/git",

docs/iris/src/userguide/plotting_a_cube.rst

@@ -209,7 +209,7 @@ the temperature at some latitude cross-sections.
     `<http://effbot.org/pyfaq/tutor-what-is-if-name-main-for.htm>`_.
 
     In order to run this example, you will need to copy the code into a file 
-    and run it using ``python2.7 my_file.py``.
+    and run it using ``python my_file.py``.
 
 
 Plotting 2-dimensional cubes