Update link to sudo password change documentation

The anchor has changed, probably because the section was renamed

howto/ldap.md

@@ -89,7 +89,7 @@ instructions on SSH public key authentication, for example.
 
 ## Set a sudo password
 
-See the [sudo password user configuration](doc/accounts#sudo).
+See the [sudo password user configuration](doc/accounts#host-specific-passwords--sudo-passwords).
 
 ## Operate the mail gateway