doc: Adds xml fixing script. (see previous and next commits)

This script is used to automatically fix issues within xml documentation
files.

The script is *for now* intended to be used ad-hoc, and the commits to
be examined.

A future discussion will define whether:

  * This commit and scripts are kept.
  * The script is extended for common use.

The biggest issue right now with the script is that it *could* in theory
destroy a valid space-less varlistentry.

The script could, in practical use, be changed and extended to normalize
some parts of the XML files, mainly:

  * A common quoting style for attributes
  * Fix-up some weird formatting automatically that xmlformat doesn't
    catch

1 files changed, 1 insertions, 1 deletions

diff --git a/nixos/doc/manual/shell.nix b/nixos/doc/manual/shell.nix
index 7f8422b4ec11..cc3609d750e0 100644
--- a/nixos/doc/manual/shell.nix
+++ b/nixos/doc/manual/shell.nix
@@ -4,5 +4,5 @@ in
 pkgs.mkShell {
   name = "nixos-manual";
 
-  buildInputs = with pkgs; [ xmlformat jing xmloscopy ];
+  buildInputs = with pkgs; [ xmlformat jing xmloscopy ruby ];
 }