Add details of using pronunciation dictionary aliases

[lharries]

Currently in the pronunciation dictionary tutorial we only discuss Phonemes: https://elevenlabs.io/docs/api-reference/how-to-use-pronunciation-dictionaries

However we also support Alias's

These are often easier to build that IPA/CMU

And also control of acronyms

For example:

• "11labs" -> "Eleven labs"
• "UN" -> "United nations"
• "Mr" -> "Mister"

It's a standard concept mentioned here: https://www.w3.org/TR/pronunciation-lexicon/

Success criteria:

• Working example in elevenlabs-examples in python and typescript
• Update the tutorial in both python and typescript

[lharries]

@cahyosubroto can you take this on?

[cahyosubroto]

@lharries for your review: https://github.com/elevenlabs/elevenlabs-docs/pull/231