docs(request): document JSON content type #1982

Job	Run time
Build (macOS)	2m 7s
Style	1m 59s
Build (Android)	4m 42s
Build (Linux)	1m 48s
Test (--features deflate,stream)	54s
Test (--features zstd,stream)	1m 11s
Test (--features json)	1m 5s
Test (--features stream)	58s
Test (--features hickory-dns)	1m 23s
Test (--features multipart)	48s
Test (--features gzip,stream)	1m 5s
Test (--features brotli,stream)	59s
Test (--features compio-rt)	2m 11s
Test (--features cookies)	56s
Build (Windows)	6m 39s
Docs	3m 33s
Test ()	2m 15s
Test (--features form)	2m 50s
Test (--all-features)	3m 29s
Test (--features query)	47s
MSRV	1m 35s
Release	0s
	43m 14s

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