docs(fix): /swaggerview/v1 has moved to /swagger/v1

[mistercrunch]

That endpoint moved as of FAB3, let's update our pointers.

[codecov-commenter]

Codecov Report

Merging #10276 into master will decrease coverage by 4.77%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10276      +/-   ##
==========================================
- Coverage   70.20%   65.42%   -4.78%     
==========================================
  Files         598      598              
  Lines       32017    32016       -1     
  Branches     3240     3240              
==========================================
- Hits        22477    20948    -1529     
- Misses       9435    10887    +1452     
- Partials      105      181      +76     

Flag	Coverage Δ
#cypress	?
#javascript	59.32% <ø> (-0.01%)	⬇️
#python	69.68% <ø> (ø)

Impacted Files	Coverage Δ
superset/config.py	90.15% <ø> (ø)
superset-frontend/src/SqlLab/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/SqlLab/index.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/dashboard/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/index.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/dashboard/index.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/setup/setupColors.js	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/chart/ChartContainer.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/setup/setupFormatters.js	0.00% <0.00%> (-100.00%)	⬇️
... and 140 more

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