set keyword to noEstimate and document it

doc/man/man5/slapd.conf.5

@@ -345,6 +345,17 @@ and
 .BR timelimit ;
 no limit is set on 
 .BR unchecked .
+
+If 
+.B pagedResults
+control is defined, additional size limits may be enforced; the syntax is
+.BR size.pr={<integer>|noEstimate} ,
+where
+.BR integer
+is the max page size if no explicit limit is set; the keyword
+.BR noEstimate
+inhibits the server to return an estimate of the total number
+of entries that will be returned.
 .RE
 .\".TP
 .\".B logfile <filename>

servers/slapd/limits.c

@@ -570,7 +570,7 @@ parse_limit(
 					return( 1 );
 				}
 				arg++;
-				if ( strcasecmp( arg, "noEntriesLeft" ) == 0 ) {
+				if ( strcasecmp( arg, "noEstimate" ) == 0 ) {
 					limit->lms_s_pr_hide = 1;
 				} else {
 					char	*next = NULL;