Fall back to module caption if instance caption is missing

Signed-off-by: trembel <silvano.cortesi@hotmail.com>

src/atdf/peripheral.rs

@@ -53,7 +53,7 @@ pub fn parse_list(
 
             peripherals.push(chip::Peripheral {
                 name: instance.attr("name")?.clone(),
-                description: instance.attr("caption").ok().cloned(),
+                description: instance.attr("caption").or(module.attr("caption")).ok().cloned(),
                 registers,
             })
         }