DOC: Add note on inference behavior of apply with result_type='expand' #23668

Job	Run time
Linux-32-bit	6m 31s
python-dev	0s
Linux-Musl	6m 31s
Pyodide build	6m 42s
macos-13 actions-312.yaml	6m 33s
macos-14 actions-311.yaml	6m 33s
windows-latest actions-310.yaml	6m 30s
macos-14 actions-312.yaml	6m 34s
windows-latest actions-311.yaml	6m 29s
macos-13 actions-313.yaml	6m 32s
macos-13 actions-311.yaml	6m 34s
macos-13 actions-310.yaml	6m 32s
macos-14 actions-313.yaml	6m 34s
macos-14 actions-310.yaml	6m 34s
windows-latest actions-312.yaml	6m 29s
windows-latest actions-313.yaml	6m 29s
ubuntu-24.04-arm actions-312.yaml	6m 32s
Future infer strings (without pyarrow)	6m 31s
ubuntu-24.04 actions-310.yaml	6m 32s
ubuntu-24.04 actions-312.yaml	6m 33s
Freethreading	6m 50s
ubuntu-24.04-arm actions-310.yaml	6m 31s
ubuntu-24.04 actions-313.yaml	6m 33s
ubuntu-24.04-arm actions-313.yaml	6m 34s
Future infer strings	6m 31s
Pypy	1m 46s
Downstream Compat	6m 9s
Locale: it_IT	6m 33s
Locale: zh_CN	6m 34s
ubuntu-24.04 actions-311.yaml	6m 33s
ubuntu-24.04-arm actions-311.yaml	6m 33s
Minimum Versions	6m 33s
Numpy Dev	6m 49s
Pyarrow Nightly	6m 50s
	3h 31m 34s

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