docs(internal): Fix index / toc

Author: tony

docs/internals/index.md

@@ -8,6 +8,11 @@ Be careful with these! Internal APIs are **not** covered by version policies. Th
 If you need an internal API stabilized please [file an issue](https://github.com/tmux-python/libtmux/issues).
 :::
 
+```{toctree}
+dataclasses
+query_list
+```
+
 ## Environmental variables
 
 (LIBTMUX_TMUX_FORMAT_SEPARATOR)=
@@ -23,10 +28,3 @@ to split `tmux(1)`'s formatting information.
 
 If you find any compatibility problems with the default, or better yet find a string copacetic
 many environments and tmux releases, note it at <https://github.com/tmux-python/libtmux/discussions/355>.
-
-## Changes
-
-```{toctree}
-dataclasses
-query_list
-``