[chore] example/otel-collector: Fix README title (#5404) #12559

Job	Run time
lint	2m 21s
test-coverage	54s
compatibility-test (~1.22.3, ubuntu-latest, 386)	57s
compatibility-test (~1.22.3, ubuntu-latest, amd64)	32s
compatibility-test (~1.22.3, macos-latest, amd64)	25s
compatibility-test (~1.22.3, windows-latest, 386)	2m 17s
compatibility-test (~1.22.3, windows-latest, amd64)	3m 25s
compatibility-test (~1.22.3, actuated-arm64-2cpu-8gb, arm64)	5m 19s
compatibility-test (~1.21.10, ubuntu-latest, 386)	20s
compatibility-test (~1.21.10, ubuntu-latest, amd64)	1m 4s
compatibility-test (~1.21.10, macos-latest, amd64)	28s
compatibility-test (~1.21.10, windows-latest, 386)	2m 53s
compatibility-test (~1.21.10, windows-latest, amd64)	3m 48s
compatibility-test (~1.21.10, actuated-arm64-2cpu-8gb, arm64)	2m 10s
test-bench	28s
test-race	2m 2s
test-compatibility	1s
	29m 24s

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