tree: Fix various typos and outdated terminology

This was mostly machine generated with the following command:
```
codespell \
    --builtin clear,rare,usage \
    --skip './po/*' --skip './.git/*' --skip './NEWS*' \
    --write-changes .
```
using the latest git version of `codespell` as per [these
instructions](https://github.com/codespell-project/codespell#user-content-updating).

Then I manually checked each change using `git add -p`, made a few
manual fixups and dropped a load of incorrect changes.

There are still some outdated or loaded terms used in GLib, mostly to do
with git branch terminology. They will need to be changed later as part
of a wider migration of git terminology.

If I’ve missed anything, please file an issue!

Signed-off-by: Philip Withnall <withnall@endlessm.com>

gio/glistmodel.c

@@ -73,7 +73,7 @@ G_DEFINE_INTERFACE (GListModel, g_list_model, G_TYPE_OBJECT)
  * it are gone.
  *
  * On the other side, a consumer is expected only to hold references on
- * objects that are currently "user visible", in order to faciliate the
+ * objects that are currently "user visible", in order to facilitate the
  * maximum level of laziness in the implementation of the list and to
  * reduce the required number of signal connections at a given time.
  *