tree: Fix various typos and outdated terminology

Philip Withnall requested to merge pwithnall/glib:codespell into master

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.

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There are still some outdated or loaded terms used in GLib, mostly to do with git branch terminology.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

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