Usually, the subdirectory name is sufficient info, and the full file list is just noise.
This reduces `brew doctor` output clutter, making it easier for user to paste, and maintainers to parse.
Before:
```
$ brew doctor
[...]
Unexpected header files:
/usr/local/include/node/cppgc/allocation.h
/usr/local/include/node/cppgc/common.h
/usr/local/include/node/cppgc/custom-space.h
/usr/local/include/node/cppgc/garbage-collected.h
/usr/local/include/node/cppgc/heap.h
/usr/local/include/node/cppgc/internal/accessors.h
/usr/local/include/node/cppgc/internal/api-constants.h
/usr/local/include/node/cppgc/internal/compiler-specific.h
/usr/local/include/node/cppgc/internal/finalizer-trait.h
/usr/local/include/node/cppgc/internal/gc-info.h
/usr/local/include/node/cppgc/internal/logging.h
/usr/local/include/node/cppgc/internal/persistent-node.h
/usr/local/include/node/cppgc/internal/pointer-policies.h
/usr/local/include/node/cppgc/internal/prefinalizer-handler.h
[about 500 more files]
```
After:
```
$ brew doctor
Unexpected header files:
/usr/local/include/node/...
```
The full list of stray files can still be viewed with `brew doctor -v`.
The main class you should look at is the {Formula} class (and classes linked from there). That's the class that's used to create Homebrew formulae (i.e. package descriptions). Assume anything else you stumble upon is private.
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