Update Example of Parsing a Manifest to Use Only `jq` (#12894)

* Update manifest.mdx

* Remove extra space in split function

---------

Co-authored-by: Wilken Rivera <dev@wilkenrivera.com>

website/content/docs/post-processors/manifest.mdx

@@ -201,7 +201,7 @@ build.
 
 #!/bin/bash
 
-AMI_ID=$(jq -r '.builds[-1].artifact_id' manifest.json | cut -d ":" -f2)
+AMI_ID=$(jq -r '.builds[-1].artifact_id | split(":") | .[1]' manifest.json)
 echo $AMI_ID
 
 ```