docs: add stats error-only troubleshooting

[Dhritimann]

Summary

Adds troubleshooting guidance for limited stats.json output when using
stats: 'error-only'.

Fixes #370

What kind of change does this PR introduce?

Documentation update.

Did you add tests for your changes?

No. This PR only changes documentation.

Does this PR introduce a breaking change?

No.

If relevant, what needs to be documented?

The troubleshooting guidance is included in README.md.=

[changeset-bot]

⚠️ No Changeset found

Latest commit: 02a3539

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Dhritimann / name: Dhritimann (02a3539)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.29%. Comparing base (34eec1b) to head (02a3539).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #730   +/-   ##
=======================================
  Coverage   76.29%   76.29%           
=======================================
  Files          17       17           
  Lines         983      983           
  Branches      358      358           
=======================================
  Hits          750      750           
  Misses        206      206           
  Partials       27       27           

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