Mention serde_as in docstring for 'apply' #1792

Job	Run time
Rustfmt (stable)	25s
clippy_check (ubuntu-latest, stable)	43s
Build and Test (ubuntu-latest, 1.64)	3m 33s
clippy_check (ubuntu-latest, nightly)	1m 18s
Build and Test (ubuntu-latest, 1.65)	3m 18s
clippy_check (windows-latest, stable)	1m 38s
Build and Test (ubuntu-latest, 1.70)	3m 2s
clippy_check (windows-latest, nightly)	2m 4s
Build and Test (ubuntu-latest, stable)	5m 17s
Build and Test (ubuntu-latest, beta)	2m 33s
Build and Test (ubuntu-latest, nightly)	2m 58s
Build and Test (windows-latest, 1.64)	4m 45s
Build and Test (windows-latest, 1.65)	4m 29s
Build and Test (windows-latest, 1.70)	4m 39s
Build and Test (windows-latest, stable)	4m 13s
Build and Test (windows-latest, beta)	3m 35s
Build and Test (windows-latest, nightly)	7m 1s
Tests result	1s
	55m 32s

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