[googelcloudexporter] Fixed configuration path in README (#31404) #51

Job	Run time
windows-unittest-matrix (receiver-0)	14m 20s
windows-unittest-matrix (receiver-1)	19m 1s
windows-unittest-matrix (processor)	17m 41s
windows-unittest-matrix (exporter)	19m 11s
windows-unittest-matrix (extension)	11m 56s
windows-unittest-matrix (internal)	19m 23s
windows-unittest-matrix (pkg)	15m 53s
windows-unittest-matrix (cmd)	19m 24s
windows-unittest-matrix (other)	19m 24s
windows-unittest	0s
	2h 36m 13s

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