Update 3.5 changelog to cover the PR of always printing raft_term in decimal

[ahrtr]

Update 3.5 changelog to cover the PR pull/13727

cc @serathius @spzala

[codecov-commenter]

Codecov Report

Merging #13728 (6f03dc7) into main (6af7601) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #13728      +/-   ##
==========================================
- Coverage   72.76%   72.71%   -0.05%     
==========================================
  Files         467      467              
  Lines       38278    38278              
==========================================
- Hits        27854    27835      -19     
- Misses       8623     8638      +15     
- Partials     1801     1805       +4     

Flag	Coverage Δ
all	72.71% <ø> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/proxy/grpcproxy/register.go	69.76% <0.00%> (-9.31%)	⬇️
client/pkg/v3/tlsutil/tlsutil.go	83.33% <0.00%> (-8.34%)	⬇️
raft/rafttest/node.go	95.00% <0.00%> (-5.00%)	⬇️
server/storage/schema/cindex.go	95.34% <0.00%> (-4.66%)	⬇️
server/storage/mvcc/watchable_store.go	85.14% <0.00%> (-3.99%)	⬇️
server/etcdserver/util.go	85.71% <0.00%> (-3.18%)	⬇️
pkg/traceutil/trace.go	96.15% <0.00%> (-1.93%)	⬇️
client/v3/leasing/cache.go	91.66% <0.00%> (-1.12%)	⬇️
server/proxy/grpcproxy/lease.go	88.23% <0.00%> (-0.91%)	⬇️
server/etcdserver/server.go	84.52% <0.00%> (-0.33%)	⬇️
... and 7 more

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