[book] fix Session.{set,free}_cnxset autodoc
They're Session methods, not bare functions.
Without this building the docs says:
reading sources... [ 39%] devrepo/repo/sessions
Traceback (most recent call last):
File "/usr/lib/pymodules/python2.7/sphinx/ext/autodoc.py", line 326, in import_object
obj = self.get_attr(obj, part)
File "/usr/lib/pymodules/python2.7/sphinx/ext/autodoc.py", line 232, in get_attr
return safe_getattr(obj, name, *defargs)
File "/usr/lib/pymodules/python2.7/sphinx/util/inspect.py", line 70, in safe_getattr
raise AttributeError(name)
AttributeError: set_cnxset
Traceback (most recent call last):
File "/usr/lib/pymodules/python2.7/sphinx/ext/autodoc.py", line 326, in import_object
obj = self.get_attr(obj, part)
File "/usr/lib/pymodules/python2.7/sphinx/ext/autodoc.py", line 232, in get_attr
return safe_getattr(obj, name, *defargs)
File "/usr/lib/pymodules/python2.7/sphinx/util/inspect.py", line 70, in safe_getattr
raise AttributeError(name)
AttributeError: free_cnxset
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