[chore] Small comments fix in exporterhelper/sizer #28369

Job	Run time
govulncheck	25s
setup-environment	15s
lint	4m 44s
checks	2m 9s
unittest-matrix (ubuntu-latest, ~1.24)	3m 7s
unittest-matrix (ubuntu-latest, ~1.23)	3m 1s
cross-build-collector (aix, ppc64)	46s
test-coverage	8m 38s
cross-build-collector (darwin, amd64)	49s
cross-build-collector (darwin, arm64)	53s
cross-build-collector (linux, 386)	42s
cross-build-collector (linux, amd64)	40s
cross-build-collector (linux, arm64)	39s
cross-build-collector (linux, ppc64le)	42s
cross-build-collector (linux, arm, 7)	38s
cross-build-collector (linux, s390x)	51s
cross-build-collector (windows, 386)	46s
cross-build-collector (windows, amd64)	48s
unittest	1s
	30m 34s

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