update LDAP.md

Author: simonLeary42

LDAP.md

@@ -1,5 +1,6 @@
 Terminology:
 
 - **qualified user**: a user who is currently a PI or a member of at least one PI group
-- **native user**: a user who's entries exist in the OUs given in `config.ini`
-  - it is up to the administrator to ensure that no non-native entries exist in these OUs
+- **native user**: a user created by this account portal
+- **non-native user**: inverse of native
+  - users created for administrative purposes should not be mixed with native users in the LDAP OUs given in `config.ini` or else this account portal may get confused