Test

ringbuf: Fix callback docs #1999

Job	Run time
Build for aarch32	50s
Build capable example with static libelf and libz	20s
Build for aarch64	1m 1s
Build [features = ['vendored']]	52s
Build [features = ['static']]	24s
Build using minimum versions of dependencies	32s
Check documentation	38s
Lint with clippy	24s
Run chosen examples	19s
Check code formatting	12s
Test [stable, dev]	1m 30s
Test [nightly, dev]	1m 25s
Test [stable, release]	2m 37s
required-checks	1s
	11m 5s

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