Design doc: Add intrinsic coordinate system name example

[keller-mark]

Hi,
I wanted to clarify the logic for inferring the intrinsic coordinate system name here by adding an example.

Please let me know if this understanding of how the intrinsic coordinate systems are named is incorrect. Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.39%. Comparing base (7604a3d) to head (e8a3e8e).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #963      +/-   ##
==========================================
+ Coverage   92.14%   92.39%   +0.24%     
==========================================
  Files          48       48              
  Lines        7473     7440      -33     
==========================================
- Hits         6886     6874      -12     
+ Misses        587      566      -21     

see 11 files with indirect coverage changes

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