Update Portuguese text normalization tutorial with enhanced examples and outputs

- Changed the language parameter in the Normalizer instance from 'en' to 'pt'.
- Added detailed output examples for the normalizer's methods, including documentation for `__doc__` and `normalize()`.
- Updated example input string to reflect a more complex Portuguese sentence for normalization.
- Adjusted execution counts for code cells to ensure proper order of execution.

This update aims to improve the clarity and usability of the tutorial for Portuguese text normalization.

Signed-off-by: Mai Anh <palasek182@gmail.com>

Author: folivoramanh