Fix a few grammar and mdoc nits in script.1

PR:		161088
Submitted by:	Ben Kaduk ( kaduk % mit ! edu )
MFC after:	1 week
Need-MFC:	225809

usr.bin/script/script.1

@@ -28,7 +28,7 @@
 .\"	@(#)script.1	8.1 (Berkeley) 6/6/93
 .\" $FreeBSD$
 .\"
-.Dd January 22, 2004
+.Dd September 28, 2011
 .Dt SCRIPT 1
 .Os
 .Sh NAME
@@ -73,15 +73,16 @@ or
 .Pa typescript ,
 retaining the prior contents.
 .It Fl k
-Log keys sent to program as well as output.
+Log keys sent to the program as well as output.
 .It Fl q
 Run in quiet mode, omit the start and stop status messages.
 .It Fl t Ar time
-Specify time interval between flushing script output file.
+Specify the interval at which the script output file will be flushed
+to disk, in seconds.
 A value of 0
 causes
 .Nm
-to flush for every character I/O event.
+to flush after every character I/O event.
 The default interval is
 30 seconds.
 .El
@@ -136,13 +137,15 @@ If
 .Ev SHELL
 is not set, the Bourne shell
 is assumed.
-(Most shells set this variable automatically).
+.Pq Most shells set this variable automatically .
 .El
 .Sh SEE ALSO
 .Xr csh 1
-(for the
+.Po
+for the
 .Em history
-mechanism).
+mechanism
+.Pc .
 .Sh HISTORY
 The
 .Nm
@@ -165,13 +168,15 @@ mode, echo cancelling is far from ideal.
 The slave terminal mode is checked
 for ECHO mode to check when to avoid manual echo logging.
 This does not
-work when in a raw mode where the program being run is doing manual echo.
+work when the terminal is in a raw mode where
+the program being run is doing manual echo.
 .Pp
-If the
+If
 .Nm
-reads zero bytes from the terminal it switches to a mode when it probes read
-only once a second until it gets some data.
-This prevents the
+reads zero bytes from the terminal, it switches to a mode when it
+only attempts to read
+once a second until there is data to read.
+This prevents
 .Nm
-spinning on zero-byte reads, but might cause a 1-second delay in
-processing of the user input.
+from spinning on zero-byte reads, but might cause a 1-second delay in
+processing of user input.