[gnumeric: 1/2] Document --export-graphs in the ssconvert manpage

[Morten Welinder <mortenw src gnome org>]

commit fcd5f239c801dcf9c89ae0e5ef3209099eccf42c
Author: Shlomi Fish <shlomif shlomifish org>
Date:   Fri Nov 29 15:50:29 2019 +0200

    Document --export-graphs in the ssconvert manpage
    
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 doc/ssconvert.1 | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/doc/ssconvert.1 b/doc/ssconvert.1
index 125d4c99f..6e7e39f5e 100644
--- a/doc/ssconvert.1
+++ b/doc/ssconvert.1
@@ -57,6 +57,10 @@ by spaces.
 The parameter names and values allowed are specific to the exporter and are
 documented below. Multiple parameters can be specified
 .TP
+.B \-\-export\-graphs
+Export the graphs (or charts) inside the input spreadsheet to
+numbered image files (SVG by default).
+.TP
 .B \-\-list\-importers
 List the available importers (file formats that can be read).
 .B \-I, \-\-import\-type=\fIID\fR