fix documentation errors

Signed-off-by: Robin Svensson <euleriancycle@gmail.com>

docs/ecs-compose-examples.md

@@ -92,7 +92,8 @@ services:
   foo:
     image: nginx
     deploy:
-      x-aws-autoscaling: 75
+      x-aws-autoscaling: 
+        cpu: 75
 ```
 
 

docs/ecs-compose-features.md

@@ -176,6 +176,6 @@ services:
         deploy:
           resources:
             limits:
-              cpu: 0.5
+              cpu: '0.5'
               memory: 2Gb
 ```