Remove single-space hard sentence breaks. These degrade the quality

of the typeset output, tend to make diffs harder to read and provide
bad examples for new-comers to mdoc.

bin/ln/symlink.7

@@ -132,7 +132,8 @@ The
 .Bx 4.4
 system differs from historical 4BSD systems in that the system call
 .Xr chown 2
-has been changed to follow symbolic links. The
+has been changed to follow symbolic links.
+The
 .Xr lchown 2
 system call was added later when the limitations of the new
 .Xr chown 2

sbin/mountd/exports.5

@@ -163,8 +163,10 @@ in an effort to be backward compatible with older export file formats.
 exports strictly according to the spec (RFC 2054 and RFC 2055) can
 be done with the
 .Fl public
-flag. However, this flag in itself allows r/w access to all files in
-the filesystem, not requiring reserved ports and not remapping uids. It
+flag.
+However, this flag in itself allows r/w access to all files in
+the filesystem, not requiring reserved ports and not remapping uids.
+It
 is only provided to conform to the spec, and should normally not be used.
 For a
 .Tn WebNFS
@@ -186,7 +188,8 @@ A
 option can be used to specify a file whose handle will be returned if
 a directory is looked up using the public filehandle (
 .Tn WebNFS Ns ).
-This is to mimic the behavior of URLs. If no
+This is to mimic the behavior of URLs.
+If no
 .Fl index
 option is specified, a directory filehandle will be returned as usual.
 The

sbin/mountd/netgroup.5

@@ -67,7 +67,8 @@ Any of the comma separated fields may be empty to specify a ``wildcard'' value
 or may consist of the string ``-'' to specify ``no valid value''.
 The members of the list may be separated by whitespace and/or commas;
 the ``\e'' character may be used at the end of a line to specify
-line continuation. Lines are limited to 1024 characters.
+line continuation.
+Lines are limited to 1024 characters.
 The functions specified in
 .Xr getnetgrent 3
 should normally be used to access the
@@ -82,25 +83,29 @@ are only used in conjunction with
 .Tn NIS
 and local
 .Pa /etc/netgroup
-files are ignored. With
+files are ignored.
+With
 .Fx ,
 .Nm Ns s
 can be used with either
 .Tn NIS
 or local files, but there are certain
-caveats to consider. The existing
+caveats to consider.
+The existing
 .Nm
 system is extremely inefficient where
 .Fn innetgr 3
 lookups are concerned since
 .Nm
-memberships are computed on the fly. By contrast, the
+memberships are computed on the fly.
+By contrast, the
 .Tn NIS
 .Nm
 database consists of three separate maps (netgroup, netgroup.byuser
 and netgroup.byhost) that are keyed to allow
 .Fn innetgr 3
-lookups to be done quickly. The
+lookups to be done quickly.
+The
 .Fx
 .Nm
 system can interact with the
@@ -152,7 +157,8 @@ token, the local data and the
 netgroup
 map will be processed as a single combined
 .Nm
-database. While this configuration is the most flexible, it
+database.
+While this configuration is the most flexible, it
 is also the least efficient: in particular,
 .Fn innetgr 3
 lookups will be especially slow if the

usr.sbin/mountd/exports.5

@@ -163,8 +163,10 @@ in an effort to be backward compatible with older export file formats.
 exports strictly according to the spec (RFC 2054 and RFC 2055) can
 be done with the
 .Fl public
-flag. However, this flag in itself allows r/w access to all files in
-the filesystem, not requiring reserved ports and not remapping uids. It
+flag.
+However, this flag in itself allows r/w access to all files in
+the filesystem, not requiring reserved ports and not remapping uids.
+It
 is only provided to conform to the spec, and should normally not be used.
 For a
 .Tn WebNFS
@@ -186,7 +188,8 @@ A
 option can be used to specify a file whose handle will be returned if
 a directory is looked up using the public filehandle (
 .Tn WebNFS Ns ).
-This is to mimic the behavior of URLs. If no
+This is to mimic the behavior of URLs.
+If no
 .Fl index
 option is specified, a directory filehandle will be returned as usual.
 The

usr.sbin/mountd/netgroup.5

@@ -67,7 +67,8 @@ Any of the comma separated fields may be empty to specify a ``wildcard'' value
 or may consist of the string ``-'' to specify ``no valid value''.
 The members of the list may be separated by whitespace and/or commas;
 the ``\e'' character may be used at the end of a line to specify
-line continuation. Lines are limited to 1024 characters.
+line continuation.
+Lines are limited to 1024 characters.
 The functions specified in
 .Xr getnetgrent 3
 should normally be used to access the
@@ -82,25 +83,29 @@ are only used in conjunction with
 .Tn NIS
 and local
 .Pa /etc/netgroup
-files are ignored. With
+files are ignored.
+With
 .Fx ,
 .Nm Ns s
 can be used with either
 .Tn NIS
 or local files, but there are certain
-caveats to consider. The existing
+caveats to consider.
+The existing
 .Nm
 system is extremely inefficient where
 .Fn innetgr 3
 lookups are concerned since
 .Nm
-memberships are computed on the fly. By contrast, the
+memberships are computed on the fly.
+By contrast, the
 .Tn NIS
 .Nm
 database consists of three separate maps (netgroup, netgroup.byuser
 and netgroup.byhost) that are keyed to allow
 .Fn innetgr 3
-lookups to be done quickly. The
+lookups to be done quickly.
+The
 .Fx
 .Nm
 system can interact with the
@@ -152,7 +157,8 @@ token, the local data and the
 netgroup
 map will be processed as a single combined
 .Nm
-database. While this configuration is the most flexible, it
+database.
+While this configuration is the most flexible, it
 is also the least efficient: in particular,
 .Fn innetgr 3
 lookups will be especially slow if the