clarify field description in rewriteRule statement

doc/man/man5/slapd-meta.5

@@ -548,7 +548,7 @@ A context may aliase another one.
 In this case the alias context contains no rule, and any reference to
 it will result in accessing the aliased one.
 .TP
-.B rewriteRule "<regex pattern>" "<substitution pattern>" "[ <flags> ]"
+.B rewriteRule "<regex match pattern>" "<substitution pattern>" "[ <flags> ]"
 Determines how a tring can be rewritten if a pattern is matched.
 Examples are reported below.
 .SH "Additional configuration syntax:"