docs: add examples to some commands

[miparnisari]

authzed/docs#308

[miparnisari]

FYI when you list, you get a NAME column, not a SYSTEM

$ zed context list
 CURRENT  NAME          ENDPOINT                                 TOKEN                  TLS CERT 
          local         localhost:50051                          <redacted>             system   
    ✓     example       localhost:50051                          <redacted>             insecure 

[codecov-commenter]

Codecov Report

❌ Patch coverage is 10.71429% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.72%. Comparing base (7ed5ab0) to head (d26cd98).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/commands/relationship.go	0.00%	12 Missing ⚠️
internal/commands/watch.go	0.00%	8 Missing ⚠️
internal/commands/permission.go	0.00%	4 Missing ⚠️
internal/storage/secrets.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #572      +/-   ##
==========================================
+ Coverage   39.28%   41.72%   +2.44%     
==========================================
  Files          37       37              
  Lines        5448     4760     -688     
==========================================
- Hits         2140     1986     -154     
+ Misses       3063     2517     -546     
- Partials      245      257      +12     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[tstirrat15]

LGTM

[tstirrat15]

LGTM