chore(docs): remove json output example since output formatting doesn't exist for validate pipeline

[colindean]

--output doesn't exist for vela pipeline validate as it does for other commands.

[wass3rw3rk]

not sure what's going on with Actions here. @colindean do you mind pushing an empty commit to retrigger the builds?

[colindean]

I pushed, but I think you have to approve the run in GHA.

This workflow requires approval from a maintainer. Learn more about approving workflows.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.84%. Comparing base (a35a2c5) to head (e109bbd).

❌ Your project check has failed because the head coverage (70.84%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #622      +/-   ##
==========================================
- Coverage   75.24%   70.84%   -4.40%     
==========================================
  Files         173      173              
  Lines        7957     4662    -3295     
==========================================
- Hits         5987     3303    -2684     
+ Misses       1666     1055     -611     
  Partials      304      304              

Files with missing lines	Coverage Δ
command/pipeline/validate.go	64.28% <ø> (+0.35%)	⬆️

... and 172 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.