Docs: Edited examing errors guide to make it more consistent with oth…

[pcoet]

…er guides

• Made the "Prerequisites" section more useful (hopefully):
  • Pointed to a more useful quickstart for the Natural Language service.
  • Pointed to our full setup guide.
• Added a "What's next" section.
• Made minor stylistic fixes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.86%. Comparing base (f0107ab) to head (88bd9e7).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2881      +/-   ##
==========================================
- Coverage   94.98%   94.86%   -0.13%     
==========================================
  Files         102      104       +2     
  Lines        4306     4339      +33     
==========================================
+ Hits         4090     4116      +26     
- Misses        216      223       +7     

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[coryan]

The robots are still unhappy, please fix.

[pcoet]

Fixed!