consistent naming

Author: xinsong-cui

codegen/aws-sdk-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/SdkIdTransform.kt

@@ -72,7 +72,7 @@ object SigV4NameTransform {
      * Replace all dashes from the SigV4 service signing name with underscores and capitalize all letters.
      */
     object UpperSnakeCase : SigV4NameTransformer {
-        override fun transform(id: String): String = id.lowercase().replaceDash("_").uppercase()
+        override fun transform(id: String): String = id.lowercase().replaceSpaceOrDash("_").uppercase()
     }
 
     /**
@@ -90,4 +90,4 @@ fun <T : StringTransformer> String.withTransform(transformer: T): String = trans
 
 private fun String.replaceWhitespace(replacement: String) = replace(whitespaceRegex, replacement)
 
-private fun String.replaceDash(replacement: String) = replace(spaceOrDashRegex, replacement)
+private fun String.replaceSpaceOrDash(replacement: String) = replace(spaceOrDashRegex, replacement)