Update amazon_polly.markdown (#28992)

* Update amazon_polly.markdown

I discovered (https://community.home-assistant.io/t/amazon-polly-ssml/11804) that Polly supports multilanguage and speed controls, which are really nice for certain announcements. As I documented the change, I figured I might as well share here.

* tiny tweak

---------

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>
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Joop 2023-09-25 08:13:41 +02:00 committed by GitHub
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@ -121,3 +121,25 @@ Say with break:
Amazon Polly
</speak>
```
## Advanced usage
Amazon Polly supports accented bilingual voices and you may find that you'd prefer the voice you like be slowed down, or speeded up. If the speed of the voice is a concern, Amazon Polly provides the ability to modify this using SSML tags. First enable SSML in configuration:
```yaml
- platform: amazon_polly
...
text_type: ssml
...
```
Note: You now need to enclose all new and previous TTS input within the `<speak></speak>` tags. To use SSML in automation, you can follow these steps, for instance:
```yaml
service: tts.amazon_polly_say
data:
cache: true
entity_id: media_player.mpd
message: >-
<speak> <prosody rate="75%">나는 <prosody rate="75%">천천히</prosody> <lang
xml:lang="fr-FR">parle</lang>.하고 있다식기세척!</speak>
language: ko-KR
```