docs(release): small fixes and deprecate apache docs

[dpgaspar]

SUMMARY

Deprecate the step to update and push old docs to Apache. Also a couple of small doc fixes

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[villebro]

Small nit, LGTM

[villebro]

The text on line 83 should probably also be updated (it's referencing 0.38.0rc1).

[codecov-io]

Codecov Report

Merging #11827 (dbc0e09) into master (bac84a3) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11827      +/-   ##
==========================================
- Coverage   67.56%   67.43%   -0.14%     
==========================================
  Files         916      916              
  Lines       44545    44545              
  Branches     4227     4227              
==========================================
- Hits        30098    30039      -59     
- Misses      14344    14399      +55     
- Partials      103      107       +4     

Flag	Coverage Δ
cypress	54.60% <ø> (-0.65%)	⬇️
javascript	62.92% <ø> (ø)
python	64.10% <ø> (ø)

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

Impacted Files	Coverage Δ
...et-frontend/src/SqlLab/reducers/getInitialState.js	33.33% <0.00%> (-16.67%)	⬇️
superset-frontend/src/reduxUtils.ts	70.88% <0.00%> (-8.87%)	⬇️
...rontend/src/SqlLab/components/TabbedSqlEditors.jsx	76.12% <0.00%> (-5.17%)	⬇️
superset-frontend/src/SqlLab/actions/sqlLab.js	60.25% <0.00%> (-4.28%)	⬇️
...rontend/src/SqlLab/components/SqlEditorLeftBar.jsx	49.01% <0.00%> (-3.93%)	⬇️
superset-frontend/src/SqlLab/reducers/sqlLab.js	37.60% <0.00%> (-3.31%)	⬇️
...end/src/SqlLab/components/TemplateParamsEditor.jsx	86.48% <0.00%> (-2.71%)	⬇️
...ponents/AdhocFilterEditPopoverSimpleTabContent.jsx	81.81% <0.00%> (-1.82%)	⬇️
...set-frontend/src/dashboard/util/getDropPosition.js	92.06% <0.00%> (-1.59%)	⬇️
...rontend/src/SqlLab/components/AceEditorWrapper.tsx	59.49% <0.00%> (-1.27%)	⬇️
... and 3 more

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