Updated the spot price docs

website/source/docs/builders/amazon-ebs.html.markdown

@@ -118,11 +118,11 @@ each category, the available configuration keys are alphabetized.
   described above. Note that if this is specified, you must omit the
   `security_group_id`.
 
-* `spot_price` (string) - The maximum hourly price to launch a spot instance
-  to create the AMI. It is a type of instances that EC2 starts when the maximum
-  price that you specify exceeds the current spot price. Spot price will be
-  updated based on available spot instance capacity and current spot Instance
-  requests. It may save you some costs. You can set this to "auto" for
+* `spot_price` (string) - The maximum hourly price to pay for a spot instance
+  to create the AMI. Spot instances are a type of instance that EC2 starts when
+  the current spot price is less than the maximum price you specify. Spot price
+  will be updated based on available spot instance capacity and current spot
+  instance requests. It may save you some costs. You can set this to "auto" for
   Packer to automatically discover the best spot price.
 
 * `spot_price_auto_product` (string) - Required if `spot_price` is set to