Documentation: teaching: address-space: Fix incorrect label in linux paging figure

[RoundRaccoon]

In the address space lecture, at the linux paging figure, there is a typo where the second "PAGE GLOBAL DIRECTORY" should be "PAGE TABLE".

[dbaluta]

This commit doesn't seem to have the subject as we discussed:

Documentation: teaching: address-space: Fix incorrect label in linux paging figure

you only added the correct subject to github PR, but that will be lost once we merge the patch.

We want to actual commit to have the message.

You can just do:

$ git commit --amend
# fix the commit
$ git push -f  # this will update the existing PR (no need to create a new one).

[dbaluta]

@RoundRaccoon we also need your Signed-off-by line in the commit message. Check git log to see other commits.

e.g Signed-off-by: FirstName LastName <email>