update manpage

sent.1

@@ -9,13 +9,13 @@
 .Op Ar file
 .Sh DESCRIPTION
 .Nm
-is a simple plaintext presentation tool for X. It does not need LaTeX,
-LibreOffice or any other fancy file format. Instead, it uses plaintext
-files to describe the slides, including support for images.
+is a simple plaintext presentation tool for X. sent does not need LaTeX,
+LibreOffice or any other fancy file format. Instead, sent reads plaintext
+describing the slides. sent can also draw images.
 .Pp
 Every paragraph represents a slide in the presentation. Especially for
 presentations using the Takahashi method this is very nice and allows
-you to write down the presentation for a quick lightning talk within a
+you to write the presentation for a quick lightning talk within a
 few minutes.
 .Sh OPTIONS
 .Bl -tag -width Ds