Omit node operator link from release notes

[kostko]

Fixes #3313

[tjanez]

Yea, this makes sense.

[codecov]

Codecov Report

Merging #3316 into master will decrease coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3316      +/-   ##
==========================================
- Coverage   65.32%   65.21%   -0.11%     
==========================================
  Files         371      371              
  Lines       33044    33044              
==========================================
- Hits        21586    21551      -35     
- Misses       8273     8311      +38     
+ Partials     3185     3182       -3     

Impacted Files	Coverage Δ
go/oasis-node/cmd/common/metrics/disk.go	65.38% <0.00%> (-19.24%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	78.94% <0.00%> (-10.53%)	⬇️
go/consensus/tendermint/api/errors.go	90.00% <0.00%> (-10.00%)	⬇️
go/consensus/tendermint/abci/state/state.go	54.54% <0.00%> (-9.10%)	⬇️
go/common/grpc/policy/policy.go	62.12% <0.00%> (-7.58%)	⬇️
go/staking/api/grpc.go	51.26% <0.00%> (-6.73%)	⬇️
go/consensus/tendermint/abci/mux.go	48.40% <0.00%> (-5.63%)	⬇️
.../consensus/tendermint/apps/epochtime_mock/state.go	70.00% <0.00%> (-5.00%)	⬇️
go/consensus/tendermint/apps/staking/query.go	35.71% <0.00%> (-4.77%)	⬇️
go/consensus/tendermint/full/services.go	77.11% <0.00%> (-4.24%)	⬇️
... and 24 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bd5100f...5160d2b. Read the comment docs.