actions: update the documentation with context examples

actions/example-pull-request/run.sh

@@ -48,7 +48,7 @@ function setup() {
     for assert in $EXAMPLE_DIR/assert-*.sh ; do
 	if ! forgejo.sh retry $assert ; then
 	    find $d
-	    cat $FORGEJO_RUNNER_LOGS
+	    sed -e 's/^/[RUNNER LOGS]/' < $FORGEJO_RUNNER_LOGS
 	    false
 	fi
     done