Update include/openthread/link.h #50

Job	Run time
channel-manager-csl	3m 22s
expects	32m 20s
packet-verification-1-1-on-1-4	12m 23s
packet-verification-low-power	10m 24s
thread-1-4-gcc-m32	11m 37s
thread-1-4-gcc-m64	11m 27s
thread-1-4-clang-10-m32	11m 18s
thread-1-4-clang-10-m64	10m 33s
thread-1-4-posix	9m 49s
upload-coverage	25s
	1h 53m 38s

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