fio.1: minor fixes

 - Document reading job files from stdin with `-';
 - Fix a typo and remove a spurious line.

Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>
diff --git a/fio.1 b/fio.1
index 35056a8..adab043 100644
--- a/fio.1
+++ b/fio.1
@@ -53,7 +53,9 @@
 a sequence of zero or more parameters, one per line, that define the
 behavior of the job.  Any line starting with a `;' or `#' character is
 considered a comment and ignored.
-job files.
+.P
+If \fIjobfile\fR is specified as `-', the job file will be read from
+standard input.
 .SS "Global Section"
 The global section contains default parameters for jobs specified in the
 job file.  A job is only affected by global sections residing above it,
@@ -87,7 +89,7 @@
 .SS "Parameter List"
 .TP
 .BI name \fR=\fPstr
-May be used to override the job name.  On the command line, this paramter
+May be used to override the job name.  On the command line, this parameter
 has the special purpose of signalling the start of a new job.
 .TP
 .BI description \fR=\fPstr