Update partial header template

Author: thogarty

templates/services/fabricv4/partial_header.mustache

@@ -6,4 +6,6 @@
     Contact: {{{.}}}
     {{/infoEmail}}
     Generated by OpenAPI Generator (https://openapi-generator.tech)
-"""
+    
+    Do not edit the class manually.
+"""  # noqa: E501