In e2c1c95 I replaced incorrect usages of `text/json` with `application/json`, but I also accidentally replaced 3 correct usages of `text/json`. This commit reverts those files to their correct state.
Per RFC 4627, the MIME type of JSON is `application/json`. However, the (commonly used) incorrect MIME type of `text/json` is used in many places throughout the Grails documentation. Grails actually supports the correct MIME type, so there is no reason to use the incorrect one in the documentation except in exceptional circumstances, if any exist. Additional information: http://stackoverflow.com/q/477816/612279
…3 RC1 application