[PR #8377/da8b133a backport][stable-7] add clarifying notes to scope description (#8385)

add clarifying notes to scope description (#8377)

(cherry picked from commit da8b133a73)

Co-authored-by: Jay Hendren <3742215+jayhendren@users.noreply.github.com>

plugins/modules/ldap_search.py

@@ -44,6 +44,8 @@ options:
     type: str
     description:
       - The LDAP scope to use.
+      - V(subordinate) requires the LDAPv3 subordinate feature extension.
+      - V(children) is equivalent to a "subtree" scope.
   filter:
     default: '(objectClass=*)'
     type: str