COMPMID-1393: Update example documentation

Change-Id: I7251575645b35b611de9d8931bb2b7dbc096de13
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/140544
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/examples/graph_resnet50.cpp b/examples/graph_resnet50.cpp
index 2970037..58f36f6 100644
--- a/examples/graph_resnet50.cpp
+++ b/examples/graph_resnet50.cpp
@@ -232,6 +232,8 @@
 
 /** Main program for ResNet50
  *
+ * @note To list all the possible arguments execute the binary appended with the --help option
+ *
  * @param[in] argc Number of arguments
  * @param[in] argv Arguments
  */