Documentation: Reverse Proxy Configuration

Update the Reverse Proxy documentation and the Release Notes to reflect
the possible changes required for reverse proxy setups (to prevent
slashes from being decoded).

This reverts the following two commits:
  27a3917dcbf851b62433a0f2360f9ac64db7938d
  768cff15b09b724cd930f904eaac867443fb966d

Change-Id: I57e93b724685ba94cb4d935fbe3d933fa12bad2d
3 files changed