If the implementation of a hook is rather standard and does not require more explanation than the hook reference provides, a shorthand documentation form may be used in place of the full function documentation block described above:

/**
 * Implements hook_help().
 */
function blog_help($section) {
  // ...
}

This generates a link to the hook reference, reminds the developer that this is a hook implementation, and avoids having to document parameters and return values that are the same for every implementation of the hook. Optionally, you can add more information in a separate paragraph to describe the particular quirks of your hook implementation.