Add clarifying comments on for IPsec forward policies

This change adds clarifying comments for the usage of the forward
policies in IPsec, and corrects a comment to properly specify the
permissions allowed.

Bug: 185495453
Test: Comment-only changes
Change-Id: I6d36522c344c41b0ebd90d46b216d115b678dd31
1 file changed
tree: e11ca3606a36e520a04b40d1155343618cacde4d
  1. core/
  2. services/