tree: Fix various typos and outdated terminology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There are still some outdated or loaded terms used in GLib, mostly to do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

@@ -546,7 +546,7 @@ _g_mount_get_for_mount_path (const gchar  *mount_path,
 
   /* TODO: How do we know this succeeded? Keep in mind that the native
    *       volume monitor may fail (e.g. not being able to connect to
-   *       hald). Is the get_mount_for_mount_path() method allowed to
+   *       udisks). Is the get_mount_for_mount_path() method allowed to
    *       return NULL? Seems like it is ... probably the method needs
    *       to take a boolean and write if it succeeds or not.. Messy.
    *       Very messy.