Add KDocs

Author: lauzadis

aws-runtime/aws-config/common/src/aws/sdk/kotlin/runtime/config/AwsSdkClientOption.kt

@@ -7,7 +7,14 @@ package aws.sdk.kotlin.runtime.config
 
 import aws.smithy.kotlin.runtime.collections.AttributeKey
 
-// AWS-specific version of smithy-kotlin's SdkClientOption
+/**
+ * Common client execution options.
+ * AWS-specific version of [aws.smithy.kotlin.runtime.client.SdkClientOption]
+ */
 public object AwsSdkClientOption {
+    /**
+     * An optional application specific identifier.
+     * When set it will be appended to the User-Agent header of every request in the form of: `app/{applicationId}`.
+     */
     public val ApplicationId: AttributeKey<String> = AttributeKey("aws.sdk.kotlin#ApplicationId")
 }