Fold entries into changelog and releasenotes

changes/bug40391

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-  o Major bugfixes (security):
-    - Resist a hashtable-based CPU denial-of-service attack against
-      relays. Previously we used a naive unkeyed hash function to look up
-      circuits in a circuitmux object. An attacker could exploit this to
-      construct circuits with chosen circuit IDs in order to try to create
-      collisions and make the hash table inefficient.  Now we use a SipHash
-      construction for this hash table instead. Fixes bug 40391; bugfix on
-      0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005.
-      Reported by Jann Horn from Google's Project Zero.

changes/bug40392

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-  o Major bugfixes (security, denial of service, onion services):
-  - Fix an out-of-bounds memory access in v3 descriptor parsing. Fixes bug
-    40392; bugfix on 0.3.0.1-alpha. This issue is also tracked as
-    TROVE-2021-006. Reported by Sergei Glazunov from Google's Project Zero.

changes/geoip-2021-06-10

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-  o Minor features (geoip data):
-    - Update the geoip files to match the IPFire Location Database,
-      as retrieved on 2021/06/10.

changes/ticket40389

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-  o Major bugfixes (relay, TROVE):
-    - Don't allow entry or middle relays to spoof RELAY_END or RELAY_RESOLVED
-      cell on half-closed streams. Fixes bug 40389; bugfix on 0.3.5.1-alpha.

changes/ticket40390

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-  o Major bugfixes (security, defense-in-depth):
-    - Detect a wider variety of failure conditions from the OpenSSL RNG
-      code. Previously, we would detect errors from a missing RNG
-      implementation, but not failures from the RNG code itself.
-      Fortunately, it appears those failures do not happen in practice
-      when Tor is using OpenSSL's default RNG implementation.
-      Fixes bug 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
-      TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.