refactor: apply renaming changes to comments (#3318)

Author: tim-lai

.env

@@ -1,9 +1,9 @@
 REACT_APP_EXTEND_ESLINT=true
 REACT_APP_COMPACT_BUNDLE=true
 
-# The following are sample settings of  REACT_APP_SWAGGER_FILE and REACT_APP_SWAGGER_URL
-# Note that applying changes to REACT_APP_SWAGGER_FILE or REACT_APP_SWAGGER_URL flags requires restart of applicaton
-# Tip: Should not set both REACT_APP_SWAGGER_FILE and REACT_APP_SWAGGER_URL flags
+# The following are sample settings of REACT_APP_DEFINITION_FILE and REACT_APP_DEFINITION_URL
+# Note that applying changes to REACT_APP_DEFINITION_FILE or REACT_APP_DEFINITION_URL flags requires restart of applicaton
+# Tip: Should not set both REACT_APP_DEFINITION_FILE and REACT_APP_DEFINITION_URL flags
 
 # Create-React-App expects static directory within /public to contain FILE
 # REACT_APP_DEFINITION_FILE=/static/petstore-oas3.yml