[TSD] fixes toggle annotation name

Description

Addresses the [problem](https://github.com/edx/edx-val/pull/268/#issuecomment-767892293) with the waffle flag naming mentioned in https://github.com/edx/edx-val/pull/268.

Also, resolves the documentation problem for [`edxval.override_existing_imported_transcripts`](https://docs.google.com/spreadsheets/d/1xWbEL6oNu6D84WKBs3aViLRM40xk-vmnmmGAeLyR09A/edit?ts=6008a109&pli=1#gid=0&range=A178) in the doc-athon.

Also removes the python 3.5 function that was added because the repository was supported python 3.5 at that time.

Done

Assignee

Robert Raposa

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Nizar Mahmoud

Repo

edx/edx-val

Customer

Epic Link

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Platform Map Area (Levels 1 & 2)

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Github Lines Added

2

Github Lines Deleted

17

Priority

Unset