changes file and manpage entry for AuthDirPinKeys

  o Major features (Ed25519 keys, keypinning)

    - The key-pinning option on directory authorities is now

      advisory-only by default. In a future version, or when the

      AuthDirPinKeys option is set, pins are enforced again.

      Disabling key-pinning seemed like a good idea so that we can

      survive the fallout of any usability problems associated with

      ed25519 keys. Closes ticket 17135.

    or more is always sufficient to satisfy the bandwidth requirement

    for the Guard flag. (Default: 250 KBytes)

[[AuthDirPinKeys]] **AuthDirPinKeys** **0**|**1**::

    Authoritative directories only. If non-zero, do not allow any relay to

    publish a descriptor if any other relay has reserved its <Ed25519,RSA>

    identity keypair. In all cases, Tor records every keypair it accepts

    in a journal if it is new, or if it differs from the most recently

    accepted pinning for one of the keys it contains. (Default: 0)

[[BridgePassword]] **BridgePassword** __Password__::

    If set, contains an HTTP authenticator that tells a bridge authority to

    serve all requested bridge information. Used by the (only partially