CHANGELOG: update CHANGELOG-3.4 from #10646

[jingyih]

Update CHANGELOG-3.4 from PR #10646.

[codecov-io]

Codecov Report

Merging #10664 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10664      +/-   ##
==========================================
+ Coverage   71.52%   71.52%   +<.01%     
==========================================
  Files         393      393              
  Lines       36628    36628              
==========================================
+ Hits        26197    26198       +1     
+ Misses       8587     8586       -1     
  Partials     1844     1844

Impacted Files	Coverage Δ
pkg/fileutil/purge.go	65.9% <0%> (-6.82%)	⬇️
clientv3/leasing/util.go	91.66% <0%> (-6.67%)	⬇️
etcdctl/ctlv3/command/lease_command.go	65.34% <0%> (-5.95%)	⬇️
etcdserver/v2_server.go	80.76% <0%> (-3.85%)	⬇️
pkg/adt/interval_tree.go	87.98% <0%> (-3.01%)	⬇️
etcdserver/api/v3election/election.go	66.66% <0%> (-2.78%)	⬇️
etcdserver/api/v3rpc/watch.go	81.69% <0%> (-2.29%)	⬇️
raft/progress.go	94.23% <0%> (-1.93%)	⬇️
mvcc/watchable_store.go	83.5% <0%> (-0.71%)	⬇️
etcdserver/server.go	74.39% <0%> (+0.14%)	⬆️
... and 12 more

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