Fix:Cloudformation descibe stacks special chars (#3514)

* Fix:descibe stacks special chars

* removed debug statements

* Linting

Co-authored-by: usmanokc <usman@okcredit.in>

moto/cloudformation/responses.py

@@ -729,7 +729,7 @@ DESCRIBE_STACKS_TEMPLATE = """<DescribeStacksResponse>
         {% if stack.change_set_id %}
         <ChangeSetId>{{ stack.change_set_id }}</ChangeSetId>
         {% endif %}
-        <Description>{{ stack.description }}</Description>
+        <Description><![CDATA[{{ stack.description }}]]></Description>
         <CreationTime>{{ stack.creation_time_iso_8601 }}</CreationTime>
         <StackStatus>{{ stack.status }}</StackStatus>
         {% if stack.notification_arns %}