syslog.conf(5): Fix a few mandoc warnings

- new sentence, new line
- skipping paragraph macro: Pp at the end of Sh

usr.sbin/syslogd/syslog.conf.5

@@ -245,7 +245,8 @@ specification is a line beginning with
 or
 .Ql \&:
 and the following blocks will be applied only when filter value
-matches given filter propertie's value. See
+matches given filter propertie's value.
+See
 .Sx PROPERTY-BASED FILTERS
 section for more details.
 .Pp
@@ -464,8 +465,8 @@ or
 .Ql \&:
 followed by three comma-separated fields
 .Em property , operator , \&"value\&" .
-Value must be double-quoted. A double quote and backslash must be escaped by
-a backslash.
+Value must be double-quoted.
+A double quote and backslash must be escaped by a backslash.
 .Pp
 Following
 .Em properties
@@ -521,7 +522,6 @@ Operator may be prefixed by
 .Ql icase_
 - to make comparison function case insensitive
 .El
-.Pp
 .Sh IMPLEMENTATION NOTES
 The
 .Dq kern