tree: Fix various typos and outdated terminology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There are still some outdated or loaded terms used in GLib, mostly to do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/win32/gwin32fsmonitorutils.c

@@ -416,7 +416,7 @@ g_win32_fs_monitor_close_handle (GWin32FSMonitorPrivate *monitor)
   /* This triggers a last callback() with nBytes==0. */
 
   /* Actually I am not so sure about that, it seems to trigger a last
-   * callback allright, but the way to recognize that it is the final
+   * callback correctly, but the way to recognize that it is the final
    * one is not to check for nBytes==0, I think that was a
    * misunderstanding.
    */