fix: OpenAPI docs small fixes

[dpgaspar]

SUMMARY

Several small fixes on the OpenAPI specs (mainly on response codes)

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #19936 (335a27a) into master (90130e4) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 335a27a differs from pull request most recent head a4756ba. Consider uploading reports for the commit a4756ba to get more accurate results

@@            Coverage Diff             @@
##           master   #19936      +/-   ##
==========================================
- Coverage   66.56%   66.53%   -0.03%     
==========================================
  Files        1714     1714              
  Lines       65043    65043              
  Branches     6723     6723              
==========================================
- Hits        43293    43277      -16     
- Misses      20037    20055      +18     
+ Partials     1713     1711       -2     

Flag	Coverage Δ
hive	52.90% <ø> (ø)
mysql	81.95% <ø> (ø)
postgres	82.00% <ø> (ø)
presto	52.76% <ø> (ø)
python	82.41% <ø> (-0.01%)	⬇️
sqlite	81.76% <ø> (ø)
unit	?

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

Impacted Files	Coverage Δ
superset/charts/api.py	85.93% <ø> (ø)
superset/dashboards/api.py	92.73% <ø> (ø)
superset/databases/api.py	94.01% <ø> (ø)
superset/embedded/api.py	93.33% <ø> (ø)
superset/importexport/api.py	100.00% <ø> (ø)
superset/reports/api.py	89.84% <ø> (ø)
superset/security/api.py	96.72% <ø> (ø)
...rd/components/nativeFilters/FilterBar/keyValue.tsx	33.33% <0.00%> (-18.52%)	⬇️
...board/components/nativeFilters/FilterBar/index.tsx	60.58% <0.00%> (-7.30%)	⬇️
superset/initialization/__init__.py	91.37% <0.00%> (-0.35%)	⬇️

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[betodealmeida]

Nice!