Amazon DynamoDB Update: Updated minor fixes for DynamoDB documentation.

Author: AWS

.changes/next-release/feature-AmazonDynamoDB-7a4a333.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Amazon DynamoDB",
+    "contributor": "",
+    "description": "Updated minor fixes for DynamoDB documentation."
+}