Merge branch 'ja-reference-checks' into 'master'

clarify scheduling reference checks

See merge request gitlab-com/www-gitlab-com!32856

source/handbook/hiring/recruiting-framework/hiring-manager/index.html.md

@@ -59,6 +59,8 @@ Once each step in the interview plan is completed, the interview team will submi
 Once the recruiter/CES has notified the hiring manager of the references sent by the candidate, the hiring manager will complete references to establish the candidate's strengths and opportunities, to set them up for success once joining GitLab. At least 2 references must be completed, and one of them must be a manager or supervisor. 
+Hiring managers are expected to contact references directly and arrange for reference call checks. Some managers send the reference a brief email stating the purpose of the call and including a Calendly link so that the reference can select a convenient time.
+
 #### Why Should Hiring Managers Check References
 We recorded a training on this subject here: