Fix api/standard constant names and documentation (#920)

* Update spec version sem-conv implement in doc.go

* Update FaaS key const names to match convention

* Add PR number to Changelog

CHANGELOG.md

@@ -31,6 +31,11 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
    Preference is given to Single Header encoding with Multiple Header being the fallback if Single Header is not found or is invalid.
    This behavior change is made to dynamically support all correctly encoded traces received instead of having to guess the expected encoding prior to receiving. (#882)
 - Extend semantic conventions for RPC. (#900)
+- To match constant naming conventions in the `api/standard` package, the `FaaS*` key names are appended with a suffix of `Key`. (#920)
+  - `"api/standard".FaaSName` -> `FaaSNameKey`
+  - `"api/standard".FaaSID` -> `FaaSIDKey`
+  - `"api/standard".FaaSVersion` -> `FaaSVersionKey`
+  - `"api/standard".FaaSInstance` -> `FaaSInstanceKey`
 
 ### Removed
 

api/standard/doc.go

@@ -16,7 +16,7 @@
 // use in OpenTelemetry. These standardizations are specified in the
 // OpenTelemetry specification:
 //
-// - https://github.com/open-telemetry/opentelemetry-specification/tree/v0.4.0/specification/resource/semantic_conventions
-// - https://github.com/open-telemetry/opentelemetry-specification/tree/v0.4.0/specification/trace/semantic_conventions
-// - https://github.com/open-telemetry/opentelemetry-specification/tree/v0.4.0/specification/metrics/semantic_conventions
+// - https://github.com/open-telemetry/opentelemetry-specification/tree/v0.6.0/specification/resource/semantic_conventions
+// - https://github.com/open-telemetry/opentelemetry-specification/tree/v0.6.0/specification/trace/semantic_conventions
+// - https://github.com/open-telemetry/opentelemetry-specification/tree/v0.6.0/specification/metrics/semantic_conventions
 package standard

api/standard/resource.go

@@ -80,16 +80,16 @@ const (
 // Standard Function-as-a-Service resource attribute keys.
 const (
 	// A uniquely identifying name for the FaaS.
-	FaaSName = kv.Key("faas.name")
+	FaaSNameKey = kv.Key("faas.name")
 
 	// The unique name of the function being executed.
-	FaaSID = kv.Key("faas.id")
+	FaaSIDKey = kv.Key("faas.id")
 
 	// The version of the function being executed.
-	FaaSVersion = kv.Key("faas.version")
+	FaaSVersionKey = kv.Key("faas.version")
 
 	// The execution environment identifier.
-	FaaSInstance = kv.Key("faas.instance")
+	FaaSInstanceKey = kv.Key("faas.instance")
 )
 
 // Standard Kubernetes resource attribute keys.