Add subscript to issue templates #1966

Job	Run time
opentelemetry-semantic-conventions	17s
opentelemetry-api	23s
opentelemetry-opencensus-shim	18s
opentelemetry-proto-gen-latest	14s
opentelemetry-opentracing-shim	16s
opentelemetry-exporter-opencensus	20s
opentelemetry-exporter-otlp-proto-common	17s
opentelemetry-exporter-otlp-proto-http	20s
opentelemetry-exporter-otlp-proto-grpc-latest	21s
opentelemetry-getting-started	22s
opentelemetry-sdk	25s
opentelemetry-exporter-otlp-combined	19s
opentelemetry-test-utils	18s
opentelemetry-propagator-b3	17s
opentelemetry-exporter-prometheus	16s
opentelemetry-exporter-zipkin-json	15s
opentelemetry-propagator-jaeger	20s
opentelemetry-exporter-zipkin-combined	19s
opentelemetry-exporter-zipkin-proto-http	14s
	5m 51s

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