config: Transition from Markdown to AsciiDoc

I haven't gone with [[config]] instead of [[config,configuration]],
because I want the section-numbered reference in the protocol listing.

Signed-off-by: W. Trevor King <[email protected]>

Author: wking

bundle.asc

@@ -14,7 +14,7 @@ This MUST include the following artifacts:
 
 1. `config.json`: contains configuration data.
    This REQUIRED file MUST reside in the root of the bundle directory and MUST be named `config.json`.
-   See `<<config>>` for more details.
+   See <<config>> for more details.
 
 2. A directory representing the root filesystem of the container.
    While the name of this REQUIRED directory may be arbitrary, users should consider using a conventional name, such as `rootfs`.