update configData template

Author: Claudenw

gcs-sink-connector/src/templates/configData.md.vm

@@ -10,6 +10,6 @@ ${esc.hash}${esc.hash} ${section.displayName}
  - Valid values:  ${section.validator|"no restrictions"}
  - Importance: $section.importance
 
- $section.documentation
+${esc.markdown($section.documentation)}
 
 #end