message: security: update distributor application example to include e-mail.
  This will reduce one of the manual steps we keep repeating.
diff: @@ -256,6 +256,11 @@ We are definitely willing to help!
  > 8. Have someone already on the list vouch for the person requesting membership
  on behalf of your distribution.
  -CrashOverride will vouch for Acidburn joining the list on behalf of the "Seven"
  -distribution.
  +CrashOverride will vouch for the "Seven" distribution joining the distribution list.
  +
  +> 9. Nominate an e-mail alias or list for your organization to receive updates. This should not be
  + an individual user address, but instead a list that can be maintained by your organization as
  + individuals come and go. A good example is envoy-security@seven.com, a bad example is
  + acidburn@seven.com. You must accept the invite sent to this address or you will not receive any
  + e-mail updates.
  ```
  