tools/fiograph: add link to file formats

To the fiograph help text add a link to a list of the supported image
file output formats.

Signed-off-by: Vincent Fu <vincent.fu@samsung.com>

diff --git a/tools/fiograph/fiograph.py b/tools/fiograph/fiograph.py
index 384decda1845cb1aded703c5f8a7691c0da0db33..8fbd1909e2fe6c94619fed2bf063e75adbc47272 100755 (executable)
--- a/tools/fiograph/fiograph.py
+++ b/tools/fiograph/fiograph.py
@@ -274,7 +274,7 @@ def setup_commandline():
     parser.add_argument('--format', action='store',
                         type=str,
                         default='png',
-                        help='the output format')
+                        help='the output format (see https://graphviz.org/docs/outputs/)')
     parser.add_argument('--view', action='store_true',
                         default=False,
                         help='view the graph')