Added marathi ITN support in documentation
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# What does this PR do ?

Added marathi ITN support to the documentation in wfst_text_normalization.rst. This corresponds to the pr https://github.com/NVIDIA/NeMo-text-processing/pull/134 in nemo_text_processing which adds ITN support for Marathi language.

# Changelog 
- Added marathi ITN support to the given file NeMo/docs/source/nlp/text_normalization/wfst/wfst_text_normalization.rst .

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