only document 'subtree', but also allow 'sub'

doc/man/man5/slapd.access.5

@@ -94,8 +94,6 @@ for an exact match of the entry,
 .B one
 to indicate all the entries immediately below the
 .BR pattern ,
-.B sub
-or
 .B subtree
 to indicate all the subentries of an entry including the entry itself,
 .B children
@@ -260,8 +258,6 @@ case apply.
 The
 .BR domain 
 clause also allows the
-.B sub
-or
 .B subtree
 style, which succeeds when a fully qualified name exactly matches the
 .BR domain

servers/slapd/aclparse.c

@@ -1282,7 +1282,7 @@ acl_usage( void )
 			"\t[aci=<attrname>]\n"
 #endif
 			"\t[ssf=<n>] [transport_ssf=<n>] [tls_ssf=<n>] [sasl_ssf=<n>]\n"
-		"<dnstyle> ::= regex | base | exact (alias of base) | one | sub[tree] | children\n"
+		"<dnstyle> ::= regex | base | exact (alias of base) | one | subtree | children\n"
 		"<style> ::= regex | base | exact (alias of base)\n"
 		"<groupflags> ::= R\n"
 		"<access> ::= [self]{<level>|<priv>}\n"