Files
tadeja f0d043cd2d MINOR: [Docs][C++] Fix doxygenfile path for arrow/flight/transport.h (#51677)
### Rationale for this change
- Empty [26.0 dev implementing-custom-transports](https://arrow.apache.org/docs/dev/cpp/api/flight.html#implementing-custom-transports) `Warning: doxygenfile: Cannot find file “arrow/flight/transport.h`
(and Sphinx building html shows the same [warning at flight.rst:207](https://github.com/apache/arrow/actions/runs/36746074972/job/109992487223?pr=51661#step:6:4145))
- While [25.0 docs](https://arrow.apache.org/docs/cpp/api/flight.html#implementing-custom-transports) renders "Implementing Custom Transports" OK.

New Breathe version 5.0.0 (breathe-doc/breathe#967, breathe-doc/breathe#1029) checks `doxygenfile` against Doxygen's index (file name transport.h) and no longer full path.

### What changes are included in this PR?
Use path `transport.h` which works both with Breathe 4.x and 5.x

### Are these changes tested?
Yes.

### Are there any user-facing changes?
No.

### Was AI used for this PR?

**PR code and description written by:**

- [X] Human
- [X] AI, only for analysis

**Reviewed before submission by:**

- [X] Human
- [ ] AI
- [ ] Not reviewed

Authored-by: Tadeja Kadunc <tadeja.kadunc@gmail.com>
Signed-off-by: Rok Mihevc <rok@mihevc.org>
2026-10-01 16:33:23 +02:00
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