CHANGELOG-3.5: update from #11564

[eddycjy]

added changelog for #11564.

[codecov-io]

Codecov Report

Merging #11637 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11637      +/-   ##
==========================================
- Coverage   66.39%   66.37%   -0.02%     
==========================================
  Files         403      403              
  Lines       36753    36753              
==========================================
- Hits        24401    24394       -7     
+ Misses      10857    10854       -3     
- Partials     1495     1505      +10     

Impacted Files	Coverage Δ
clientv3/ordering/util.go	26.66% <0.00%> (-73.34%)	⬇️
auth/options.go	57.50% <0.00%> (-35.00%)	⬇️
client/keys.go	70.35% <0.00%> (-21.11%)	⬇️
etcdserver/api/v3rpc/util.go	51.61% <0.00%> (-16.13%)	⬇️
clientv3/namespace/watch.go	87.87% <0.00%> (-6.07%)	⬇️
pkg/testutil/recorder.go	77.77% <0.00%> (-3.71%)	⬇️
etcdserver/api/v3election/election.go	61.11% <0.00%> (-2.78%)	⬇️
clientv3/concurrency/election.go	79.68% <0.00%> (-2.35%)	⬇️
etcdserver/v3_server.go	72.39% <0.00%> (-1.96%)	⬇️
etcdserver/api/v3rpc/watch.go	83.85% <0.00%> (-1.76%)	⬇️
... and 14 more

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[jpbetz]

LGTM

[gyuho]

Can we rebase

[eddycjy]

@gyuho I have resolved the conflict.