clientv3: fix goword checking in config.go

[jingyih]

No description provided.

[codecov-io]

Codecov Report

Merging #10149 into master will increase coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10149      +/-   ##
==========================================
+ Coverage   71.69%   71.95%   +0.26%     
==========================================
  Files         390      390              
  Lines       36307    36307              
==========================================
+ Hits        26029    26126      +97     
+ Misses       8474     8388      -86     
+ Partials     1804     1793      -11

Impacted Files	Coverage Δ
proxy/grpcproxy/watcher.go	89.79% <0%> (-4.09%)	⬇️
etcdserver/api/v3rpc/watch.go	83.66% <0%> (-0.99%)	⬇️
etcdserver/v3_server.go	80.09% <0%> (+0.45%)	⬆️
etcdserver/server.go	75.08% <0%> (+0.57%)	⬆️
pkg/proxy/server.go	60.87% <0%> (+0.67%)	⬆️
etcdserver/cluster_util.go	59.64% <0%> (+0.89%)	⬆️
etcdserver/api/rafthttp/peer.go	79.88% <0%> (+1.11%)	⬆️
etcdserver/api/v2http/client.go	86.72% <0%> (+1.2%)	⬆️
pkg/schedule/schedule.go	83.09% <0%> (+1.4%)	⬆️
raft/node.go	92.72% <0%> (+1.53%)	⬆️
... and 17 more

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[gyuho]

lgtm thanks!