fix(docs): Update title of API ref (#445)

Author: Carey-AWS

.github/workflows/api-docs.yml

@@ -192,7 +192,7 @@ jobs:
           echo "            <div id='logo'></div>" >> $INDEX_FILE
           echo "        </div>" >> $INDEX_FILE
           echo "        <div id='main' class='main-content'>" >> $INDEX_FILE
-          echo "            <h2>AWS SDK for Kotlin API Docs</h2>" >> $INDEX_FILE
+          echo "            <h2>AWS SDK for Kotlin API Reference</h2>" >> $INDEX_FILE
           echo "            <div class='table'>" >> $INDEX_FILE
 
           # Generate list of services
@@ -233,4 +233,4 @@ jobs:
         with:
           tag_name: ${{ needs.smithy-kotlin-docs.outputs.source-ref }}-api-docs
           files: |
-            kotlin-sdk-api-docs.zip
+            kotlin-sdk-api-docs.zip