gnu: Add comments to the bottom of a few more package modules.

This will hopefully discourage patches which add new packages to the bottom of
files, as this increases the likelihood of conflicts when applying patches.

If there are more specific ways that packages should be arranged in specific
modules, this message can be updated accordingly.

* gnu/packages/crates-graphics.scm: Add comment discouraging adding packages
to the bottom of the file.
* gnu/packages/crates-gtk.scm: ditto.
* gnu/packages/games.scm: ditto.
* gnu/packages/music.scm: ditto.
* gnu/packages/qt.scm: ditto.
* gnu/packages/web.scm: ditto.

1 files changed, 6 insertions, 0 deletions

diff --git a/gnu/packages/crates-gtk.scm b/gnu/packages/crates-gtk.scm
index e392220a01..c0cdc13a59 100644
--- a/gnu/packages/crates-gtk.scm
+++ b/gnu/packages/crates-gtk.scm
@@ -1834,3 +1834,9 @@ library.")
     (synopsis "Rust binding for webkit-gtk library")
     (description "This crate provides Rust binding for webkit-gtk library.")
     (license license:expat)))
+
+;;;
+;;; Avoid adding new packages to the end of this file. To reduce the chances
+;;; of a merge conflict, place them above by existing packages with similar
+;;; functionality or similar names.
+;;;