docs: update outdated country map tools instructions

[ktmud]

SUMMARY

Update the Country Map Tools doc to reflect the new process of adding a country map.

Also removed redundant information about ISO codes to make the docs easier to read (added a link to Wikipedia for anyone interested).

Also updated error handling in viz.py for country map to give more actionable errors.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before

After

TEST PLAN

CI and verify docs site locally

[ktmud]

For some reason I couldn't get the local doc builds to work.

        
success run static queries - 3.785s - 5/5 1.32/s
success run page queries - 0.073s - 125/125 1717.76/s
error Generating development JavaScript bundle failed

JSON5: invalid end of input at 1:1
Occurred while linting /Users/jesse_yang/projects/superset-fork/docs/src/pages/404.jsx:22
failed Building development bundle - 33.582s
success building schema - 3.975s

@pkdotson , have you seen this error before?

[michael-s-molina]

Thanks for updating the docs! 🚀

[michael-s-molina]

LGTM

[codecov]

Codecov Report

Merging #14027 (395a003) into master (2c96c5b) will decrease coverage by 0.15%.
The diff coverage is 52.38%.

❗ Current head 395a003 differs from pull request most recent head 0e6ddb4. Consider uploading reports for the commit 0e6ddb4 to get more accurate results

@@            Coverage Diff             @@
##           master   #14027      +/-   ##
==========================================
- Coverage   79.30%   79.14%   -0.16%     
==========================================
  Files         938      940       +2     
  Lines       47523    47605      +82     
  Branches     5940     5979      +39     
==========================================
- Hits        37687    37679       -8     
- Misses       9710     9800      +90     
  Partials      126      126              

Flag	Coverage Δ
cypress	56.06% <ø> (+<0.01%)	⬆️
hive	?
mysql	80.71% <52.38%> (-0.01%)	⬇️
postgres	80.75% <52.38%> (-0.01%)	⬇️
presto	80.46% <52.38%> (?)
python	81.04% <52.38%> (-0.12%)	⬇️
sqlite	80.35% <52.38%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...end/src/dashboard/components/SliceHeader/index.tsx	41.02% <ø> (ø)
...dashboard/components/menu/ShareMenuItems/index.tsx	25.00% <ø> (ø)
superset/viz.py	55.65% <0.00%> (-0.26%)	⬇️
superset/charts/api.py	81.81% <100.00%> (+0.51%)	⬆️
superset/exceptions.py	100.00% <100.00%> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
...c/filters/components/Select/SelectFilterPlugin.tsx	50.00% <0.00%> (-30.96%)	⬇️
superset/db_engine_specs/hive.py	74.42% <0.00%> (-16.42%)	⬇️
... and 6 more

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