ami.md in aws-ec2-1.3.1

- old
+ new

@@ -1,9 +1,9 @@
 Examples:
 
-    $ aws-ec2 clean ami base-amazonlinux2
-    $ aws-ec2 clean ami base-ubuntu --keep 5
+    $ aws-ec2 clean ami 'base-amazonlinux2*'
+    $ aws-ec2 clean ami 'base-ubuntu*' --keep 5
 
 Deletes old AMIs using the provided name as the base portion of the AMI name to search for.
 
 Let's say you have these images:
 
@@ -14,8 +14,8 @@
     base-ubuntu_2018-03-25-02-43
     base-ubuntu_2018-03-23-00-15
 
 Running:
 
-    $ aws-ec2 clean ami base-ubuntu
+    $ aws-ec2 clean ami 'base-ubuntu*'
 
-Would delete all images and keep the 2 most recent AMIs.  The default `--keep` value is 2.
+Would delete all images and keep the 2 most recent AMIs.  The default `--keep` value is 2.  Make sure to surround the query pattern with a single quote to prevent shell glob expansion.