More doc fixes

mitterlib/network/networkbase.py

@@ -149,12 +149,12 @@ class NetworkData(object):
     **network**
        The network id source of the message. Network classes don't need to
        worry about this field themselves; :class:`Networks` will set it when
-       merging information from all networks. *Networks should **NEVER** fill
+       merging information from all networks. *Networks should NEVER fill
        this field*
 
     .. [*] Not all fields need to be filled if that would require more than
        one network call.
-    .. [*] Most networks need to be ready for some fields to not be filled.
+    .. [*] Interfaces should be aware that optional fields may not be filled.
     """
 
     def __init__(self):