doc: update knot.conf.5in

doc/man/knot.conf.5in

@@ -881,9 +881,9 @@ the immediate sync with a zone file is not desirable, increase the value.
 \fBWARNING:\fP
 .INDENT 0.0
 .INDENT 3.5
-If the zone file is not up\-to\-date, the zone should be flushed before
-editation or the SOA record must be untouched after editation. Otherwise
-the journal can\(aqt be applied.
+If the zone file is not up\-to\-date, the zone should be flushed before its
+zone file editation or the SOA record must be untouched after editation.
+Otherwise the journal can\(aqt be applied.
 .UNINDENT
 .UNINDENT
 .sp