fix(docs): Correct i2s.rst api documentation example

[szprytny]

Description of Change

Fix of i2s api documentation - example used incorrect method which is not declared.

Tests scenarios

I have tested example on arduino-esp32 core v3.0.2 with ESP32-S3 Board.

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	Messages
📖	This PR seems to be quite large (total lines of code: 517410), you might consider splitting it into smaller PRs

👋 Hello szprytny, we appreciate your contribution to this project!

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