man: Clarify the `trap` condition `EXIT`

Signed-off-by: Christoph Anton Mitterer <mail@christoph.anton.mitterer.name>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/src/dash.1 b/src/dash.1
index 96ce89e..dbc34c9 100644
--- a/src/dash.1
+++ b/src/dash.1
@@ -2157,7 +2157,8 @@
 .Li 0
 or
 .Li EXIT ,
-the action is executed when the shell exits.
+the action is executed when the shell exits normally (that is not via an
+unhandled signal like SIGINT).
 .Ar action
 may be empty
 .Li ( "''" ) ,