[GrpcNetClient] Clarify impact to SuppressDownstreamInstrumentation #4783

Job	Run time
detect-changes	4s
lint-misspell-sanitycheck / run-sanitycheck	7s
lint-misspell-sanitycheck / run-misspell	4s
lint-dotnet-format	0s
build-test-solution-experimental	0s
build-test-instrumentation-experimental	0s
build-test-instrumentation-stable	0s
build-test-solution-stable	0s
otlp-integration-test	0s
concurrency-tests	0s
validate-packages	0s
verify-aot-compat	0s
w3c-trace-context-integration-test	0s
lint-md / run-markdownlint	4s
generate-docs / run-docfx-build	2m 35s
build-test	3s
	2m 57s

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