docs: update changelog for release v3.0.4

[justxuewei]

What this PR does:

Updated changelog for release v3.0.4. Fixed some typos in the changelog.

Which issue(s) this PR fixes:
Fixes #

You should pay attention to items below to ensure your pr passes our ci test
We do not merge pr with ci tests failed

• All ut passed (run 'go test ./...' in project root)
• After go-fmt ed , run 'go fmt project' using goland.
• Golangci-lint passed, run 'sudo golangci-lint run' in project root.
• Your new-created file needs to have apache license at the top, like other existed file does.
• All integration test passed. You can run integration test locally (with docker env). Clone our dubbo-go-samples project and replace the go.mod to your dubbo-go, and run 'sudo sh start_integration_test.sh' at root of samples project root. (M1 Slice is not Support)

[justxuewei]

I closed #2141 and reopened this pull request that the target branch is 3.0. I still found that SonarCloud failed because of duplication as previously. It should be ignored. Please @binbin0325 @zhaoyunxing92 @AlexStocks take a look.

[codecov-commenter]

Codecov Report

Merging #2147 (6001f0f) into 3.0 (9e4452a) will decrease coverage by 0.87%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              3.0    #2147      +/-   ##
==========================================
- Coverage   45.21%   44.34%   -0.88%     
==========================================
  Files         283      283              
  Lines       17572    17050     -522     
==========================================
- Hits         7946     7561     -385     
+ Misses       8795     8692     -103     
+ Partials      831      797      -34     

Impacted Files	Coverage Δ
protocol/dubbo3/dubbo3_invoker.go	53.27% <0.00%> (-9.64%)	⬇️
remoting/getty/getty_server.go	46.49% <0.00%> (-9.28%)	⬇️
metadata/report/delegate/delegate_report.go	35.09% <0.00%> (-7.29%)	⬇️
remoting/getty/getty_client.go	43.60% <0.00%> (-7.22%)	⬇️
config/service_config.go	53.04% <0.00%> (-5.21%)	⬇️
protocol/grpc/client.go	63.01% <0.00%> (-4.73%)	⬇️
remoting/getty/pool.go	42.47% <0.00%> (-4.54%)	⬇️
...tocol/rest/server/server_impl/go_restful_server.go	41.37% <0.00%> (-3.45%)	⬇️
protocol/grpc/server.go	67.81% <0.00%> (-3.22%)	⬇️
config/reference_config.go	26.35% <0.00%> (-3.20%)	⬇️
... and 9 more

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
4.0% Duplication