LDAP should be capitalized in /etc/master.passwd (_ypldap entry)

[bcr]

Summary

D5062 (https://reviews.freebsd.org/D5062) added a _ypldap entry to /etc/group and /etc/master.passwd . The latter has
YP Ldap in the description field. I think that it should be capitalized in master.passwd, as "LDAP" is a widely used acronym and Ldap is rarely used.
Adding the original reviewers of D5062. Note that I don't have a src bit, but a doc bit. Might need some help when committing to HEAD.

Test Plan

Make Buildworld/Installworld, check /etc/master.passwd afterwards whether the description for _ypldap now reads "YP LDAP".

[bcr]

ping?