fix: erase edx reference in the glossary

[Apgomeznext]

This PR erase the edX reference in the glossary that belong to the developers section.

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Thanks for the pull request, @Apgomeznext!

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[Apgomeznext]

I recently found a similar glossary in the educator's section from the documents John migrated. It is here: https://docs.openedx.org/en/latest/educators/references/glossary.html.
We should only keep one of them so as not to duplicate the content.

[sarina]

@Apgomeznext which are you proposing to keep?

[sarina]

@jswope00 - in this PR, references to partnercoursestaff docs have simply been removed. Do you think that's the right thing to do?