Updated language around how to address mentors.

Author: kgodey

content/internships/applicant-guide/contents.lr

@@ -72,7 +72,7 @@ All the CC mentors are on [Slack](/community). **Please use public channels on S
 
 Remember that the mentors are busy – we've got full-time jobs or other commitments. It's good to follow up if you don't get a response, but wait a couple of days first.
 
-**Please do not address mentors as "sir" or "ma'am". We prefer to be addressed by our first names or usernames.**
+**Please refrain from addressing mentors as "sir" or "ma'am". We prefer to be addressed by our first names or usernames.**
 
 ## Intern Selection Criteria