Doc: Handshake should pass TRUE for initiatorOnlyDiffusionMode

[AndrewWestberg]

Description

The network-spec.pdf document describes the handshake protocol as passing a bool flag for initiatorAndResponderDiffusionMode. According to the haskell code, this should really be initiatorOnlyDiffusionMode since we should pass TRUE for requesting a unidirectional connection. I've confirmed with @karknu that this corrects a misunderstanding in the spec doc.

Checklist

• Branch
  • Updated changelog files.
  • Commit sequence broadly makes sense
  • Commits have useful messages
  • The documentation has been properly updated
  • New tests are added if needed and existing tests are updated
  • If serialization changes, user-facing consequences (e.g. replay from genesis) are confirmed to be intentional.
• Pull Request
  • Self-reviewed the diff
  • Useful pull request description at least containing the following information:
    • What does this PR change?
    • Why these changes were needed?
    • How does this affect downstream repositories and/or end-users?
    • Which ticket does this PR close (if any)? If it does, is it linked?
  • Reviewer requested

[karknu]

Good catch!
LGTM

[coot]

LGTM