fix: correct typo 'seperator' to 'separator'

[thecaptain789]

Fix typos in phonemizer modules. Changes parameter name and docstring typo.

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[eginhard]

Thanks for the PR! This repo is not maintained anymore, but feel free to send this to our fork where I can merge it: https://github.com/idiap/coqui-ai-TTS

[stale]

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