mdoc(7) police: added missing newline after .Dv macro call,

removed hard sentence breaks.

lib/libc/sys/open.2

@@ -57,7 +57,8 @@ The
 argument may indicate the file is to be
 created if it does not exist (by specifying the
 .Dv O_CREAT
-flag).  In this case 
+flag).
+In this case 
 .Nm
 requires a third argument
 .Fa "mode_t mode" ,
@@ -91,7 +92,8 @@ O_NOFOLLOW	do not follow symlinks
 Opening a file with
 .Dv O_APPEND
 set causes each write on the file
-to be appended to the end.  If
+to be appended to the end.
+If
 .Dv O_TRUNC
 is specified and the
 file exists, the file is truncated to zero length.
@@ -102,7 +104,8 @@ is set with
 and the file already
 exists,
 .Fn open
-returns an error.  This may be used to
+returns an error.
+This may be used to
 implement a simple exclusive access locking mechanism.
 If
 .Dv O_EXCL
@@ -151,11 +154,12 @@ If creating a file with
 the request for the lock will never fail
 (provided that the underlying filesystem supports locking).
 .Pp
-.Dv O_DIRECT may be used to
-minimize or eliminate the cache effects of reading and writing.  The system
-will attempt to avoid caching the data you read or write.  If it cannot
-avoid caching the data, it will minimize the impact the data has on the cache.
-Use of this flag can drastically reduce performance if not used with care. 
+.Dv O_DIRECT
+may be used to minimize or eliminate the cache effects of reading and writing.
+The system will attempt to avoid caching the data you read or write.
+If it cannot avoid caching the data,
+it will minimize the impact the data has on the cache.
+Use of this flag can drastically reduce performance if not used with care.
 .Pp
 If successful,
 .Fn open