Light editing to changes entries for 0.4.7.5-alpha

  o Major bugfixes (relay, DNS):

    - Lower the DNS timeout from 3 attempts at 5 seconds each to 2 attempts at

      1 seconds each. Two new consensus parameters were added to control these

      values. See ticket for more details on why. Fixes bug 40312; bugfix on

      values. This change should improve observed performance under DNS load;

      see ticket for more details. Fixes bug 40312; bugfix on

      0.3.5.1-alpha.

  o Minor bugfixes (relay, overload):

    - Use a fraction and assessment period of ntor handshake drops for the

      overload general signal. Before that, a single drop could trigger an

      overload state which was far from useful. Fixes bug 40560; bugfix on

      0.4.7.1-alpha.

    - Decide whether to signal overload based on a fraction and

      assessment period of ntor handshake drops. Previously, a single

      drop could trigger an overload state, which caused many false

      positives. Fixes bug 40560; bugfix on 0.4.7.1-alpha.

  o Minor bugfixes (onion service congestion control):

    - Avoid a non fatal assert in case we can't setup congestion control on the

      rendezvous circuit after opening. Fixes bug 40576; bugfix on

      0.4.7.4-alpha.

    - Avoid a non-fatal assertion failure in the case where we fail to set up

      congestion control on a rendezvous circuit. This could happen naturally

      if a cache entry expired at an unexpected time. Fixes bug 40576; bugfix

      on 0.4.7.4-alpha.

  o Minor bugfixes (onion service, client):

    - Fix a fatal assert due to a guard subsystem recursion triggered by the

    - Fix a rare but fatal assertion failure due to a guard subsystem

      recursion triggered by the

      onion service client. Fixes bug 40579; bugfix on 0.3.5.1-alpha.