[processor/k8sattributes] fix(docs): typo for kubernetes label (#29110) #1

Job	Run time
windows-unittest-matrix (receiver-0)	15m 25s
windows-unittest-matrix (receiver-1)	13m 47s
windows-unittest-matrix (processor)	12m 10s
windows-unittest-matrix (exporter)	16m 39s
windows-unittest-matrix (extension)	16m 35s
windows-unittest-matrix (internal)	16m 20s
windows-unittest-matrix (pkg)	16m 35s
windows-unittest-matrix (cmd)	16m 38s
windows-unittest-matrix (other)	15m 29s
windows-unittest	0s
	2h 19m 38s

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