tree: Fix various typos and outdated terminology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There are still some outdated or loaded terms used in GLib, mostly to do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/gregistrysettingsbackend.c

@@ -745,7 +745,7 @@ registry_cache_update_node (GNode        *cache_node,
 }
 
 /* Blocking notifications is a useful optimisation. When a change is made
- * through GSettings we update the cache manually, but a notifcation is
+ * through GSettings we update the cache manually, but a notification is
  * triggered as well. This function is also used for nested notifications,
  * eg. if /test and /test/foo are watched, and /test/foo/value is changed then
  * we will get notified both for /test/foo and /test and it is helpful to block