docs: add new configuration option in spanmetricsconnector (#30436) #13

Job	Run time
windows-unittest-matrix (receiver-0)	15m 43s
windows-unittest-matrix (receiver-1)	15m 44s
windows-unittest-matrix (processor)	15m 0s
windows-unittest-matrix (exporter)	15m 30s
windows-unittest-matrix (extension)	14m 10s
windows-unittest-matrix (internal)	13m 51s
windows-unittest-matrix (pkg)	12m 39s
windows-unittest-matrix (cmd)	15m 43s
windows-unittest-matrix (other)	15m 42s
windows-unittest	0s
	2h 14m 2s

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