MINOR ISSUE: Wording of inter-WG communication mechanisms

[Harald Tveit Alvestrand]

-issue- section 2.3 says:

o  The IETF does not posess effective mechanisms for inter-WG
      cooperation or communication.

ISSUE: The informal mechanisms that exist (talk to each other!) are often 
effective when they work, but invisible to the formal structures.
SUGGESTED RESOLUTION: Insert "formal" after "effective".