fix: increase reliability of formatting and filtering instructions

[burkedavison]

• Clarify use of format vs filter for column vs row selection, respectively.
• Provide guidance on questioning receiving zero results.
• Provide example syntax for projections.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.23%. Comparing base (b0a2558) to head (d7b756c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #332   +/-   ##
=======================================
  Coverage   94.23%   94.23%           
=======================================
  Files          50       50           
  Lines        3779     3779           
  Branches      373      373           
=======================================
  Hits         3561     3561           
  Misses        218      218           

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