Nit fixes to bug template (#2161)

Author: cijothomas

.github/ISSUE_TEMPLATE/BUG-REPORT.yml

@@ -20,15 +20,15 @@ body:
   - type: textarea
     id: api-version
     attributes:
-      label: API Version
+      label: OpenTelemetry API Version (i.e version of `opentelemetry` crate)
       description: What version of the `opentelemetry` crate are you using?
       placeholder: 0.x, 1.x, etc.
     validations:
       required: true
   - type: textarea
     id: sdk-version
     attributes:
-      label: SDK Version
+      label: label: OpenTelemetry SDK Version (i.e version of `opentelemetry_sdk` crate)
       description: What version of the `opentelemetry_sdk` crate are you using?
       placeholder: 0.x, 1.x, etc.
     validations:
@@ -39,6 +39,7 @@ body:
       label: What Exporter(s) are you seeing the problem on?
       multiple: true
       options:
+        - stdout
         - OTLP
         - Zipkin
         - Prometheus