remove vestigal uses of the old DOXYGEN_SHOULD_SKIP_THIS macro

[ericniebler]

Description

i stumbled across two additional uses of the no-longer-used DOXYGEN_SHOULD_SKIP_THIS macro. i suspect they snuck back in when these two memory resource files were moved into cudax.

this pr replaces the old macro with the new _CCCL_DOXYGEN_INVOKED macro.

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[github-actions]

🟩 CI finished in 29m 33s: Pass: 100%/54 | Total: 3h 59m | Avg: 4m 26s | Max: 15m 36s | Hits: 90%/256

• 🟩 cudax: Pass: 100%/54 | Total: 3h 59m | Avg: 4m 26s | Max: 15m 36s | Hits: 90%/256

  🟩 cpu
    🟩 amd64              Pass: 100%/50  | Total:  3h 47m | Avg:  4m 33s | Max: 15m 36s | Hits:  90%/256   
    🟩 arm64              Pass: 100%/4   | Total: 11m 40s | Avg:  2m 55s | Max:  3m 51s
  🟩 ctk
    🟩 12.0               Pass: 100%/19  | Total:  1h 23m | Avg:  4m 24s | Max: 15m 36s | Hits:  90%/128   
    🟩 12.5               Pass: 100%/2   | Total: 10m 22s | Avg:  5m 11s | Max:  5m 12s
    🟩 12.6               Pass: 100%/33  | Total:  2h 25m | Avg:  4m 24s | Max: 15m 20s | Hits:  90%/128   
  🟩 cudacxx
    🟩 nvcc12.0           Pass: 100%/19  | Total:  1h 23m | Avg:  4m 24s | Max: 15m 36s | Hits:  90%/128   
    🟩 nvcc12.5           Pass: 100%/2   | Total: 10m 22s | Avg:  5m 11s | Max:  5m 12s
    🟩 nvcc12.6           Pass: 100%/33  | Total:  2h 25m | Avg:  4m 24s | Max: 15m 20s | Hits:  90%/128   
  🟩 cudacxx_family
    🟩 nvcc               Pass: 100%/54  | Total:  3h 59m | Avg:  4m 26s | Max: 15m 36s | Hits:  90%/256   
  🟩 cxx
    🟩 Clang9             Pass: 100%/2   | Total:  6m 46s | Avg:  3m 23s | Max:  3m 43s
    🟩 Clang10            Pass: 100%/2   | Total:  6m 25s | Avg:  3m 12s | Max:  3m 36s
    🟩 Clang11            Pass: 100%/4   | Total: 11m 45s | Avg:  2m 56s | Max:  3m 12s
    🟩 Clang12            Pass: 100%/4   | Total: 11m 48s | Avg:  2m 57s | Max:  3m 06s
    🟩 Clang13            Pass: 100%/4   | Total: 11m 50s | Avg:  2m 57s | Max:  3m 19s
    🟩 Clang14            Pass: 100%/4   | Total: 23m 31s | Avg:  5m 52s | Max: 14m 34s
    🟩 Clang15            Pass: 100%/2   | Total:  6m 39s | Avg:  3m 19s | Max:  3m 20s
    🟩 Clang16            Pass: 100%/4   | Total: 12m 38s | Avg:  3m 09s | Max:  3m 51s
    🟩 Clang17            Pass: 100%/2   | Total:  6m 28s | Avg:  3m 14s | Max:  3m 15s
    🟩 Clang18            Pass: 100%/2   | Total: 18m 09s | Avg:  9m 04s | Max: 15m 05s
    🟩 GCC9               Pass: 100%/2   | Total:  6m 03s | Avg:  3m 01s | Max:  3m 09s
    🟩 GCC10              Pass: 100%/4   | Total: 11m 29s | Avg:  2m 52s | Max:  3m 06s
    🟩 GCC11              Pass: 100%/4   | Total: 11m 51s | Avg:  2m 57s | Max:  3m 11s
    🟩 GCC12              Pass: 100%/7   | Total: 58m 55s | Avg:  8m 25s | Max: 15m 36s
    🟩 GCC13              Pass: 100%/3   | Total:  7m 54s | Avg:  2m 38s | Max:  2m 44s
    🟩 MSVC14.36          Pass: 100%/1   | Total:  8m 14s | Avg:  8m 14s | Max:  8m 14s | Hits:  90%/128   
    🟩 MSVC14.39          Pass: 100%/1   | Total:  8m 39s | Avg:  8m 39s | Max:  8m 39s | Hits:  90%/128   
    🟩 NVHPC24.7          Pass: 100%/2   | Total: 10m 22s | Avg:  5m 11s | Max:  5m 12s
  🟩 cxx_family
    🟩 Clang              Pass: 100%/30  | Total:  1h 55m | Avg:  3m 51s | Max: 15m 05s
    🟩 GCC                Pass: 100%/20  | Total:  1h 36m | Avg:  4m 48s | Max: 15m 36s
    🟩 MSVC               Pass: 100%/2   | Total: 16m 53s | Avg:  8m 26s | Max:  8m 39s | Hits:  90%/256   
    🟩 NVHPC              Pass: 100%/2   | Total: 10m 22s | Avg:  5m 11s | Max:  5m 12s
  🟩 gpu
    🟩 v100               Pass: 100%/54  | Total:  3h 59m | Avg:  4m 26s | Max: 15m 36s | Hits:  90%/256   
  🟩 jobs
    🟩 Build              Pass: 100%/49  | Total:  2h 43m | Avg:  3m 20s | Max:  8m 39s | Hits:  90%/256   
    🟩 Test               Pass: 100%/5   | Total:  1h 15m | Avg: 15m 10s | Max: 15m 36s
  🟩 sm
    🟩 90                 Pass: 100%/1   | Total:  2m 36s | Avg:  2m 36s | Max:  2m 36s
    🟩 90a                Pass: 100%/1   | Total:  2m 38s | Avg:  2m 38s | Max:  2m 38s
  🟩 std
    🟩 17                 Pass: 100%/29  | Total:  1h 54m | Avg:  3m 56s | Max: 15m 36s
    🟩 20                 Pass: 100%/25  | Total:  2h 05m | Avg:  5m 00s | Max: 15m 19s | Hits:  90%/256   
  

👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	python
	CCCL C Parallel Library
	Catch2Helper

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	python
	CCCL C Parallel Library
	Catch2Helper

🏃‍ Runner counts (total jobs: 54)

#	Runner
43	linux-amd64-cpu16
5	linux-amd64-gpu-v100-latest-1
4	linux-arm64-cpu16
2	windows-amd64-cpu16