Clarify behavior of @jit foo(bar(x))

[lassepe]

xref #1954

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.64%. Comparing base (b39a1fc) to head (e797dbd).
⚠️ Report is 264 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1955      +/-   ##
==========================================
+ Coverage   68.16%   70.64%   +2.48%     
==========================================
  Files         109      124      +15     
  Lines       11779    13793    +2014     
==========================================
+ Hits         8029     9744    +1715     
- Misses       3750     4049     +299     

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