Update BLOOM Overview in Doc: Add programming languages
Author: cakiki
Pull request: yes

The current wording makes it sound as if the programming languages are part of the 46 natural languages. This PR adds the exact number of programming languages to avoid confusion.

# What does this PR do?

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Fixes # (issue)


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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## Who can review?

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I'm not sure who to tag for this, so maybe @osanseviero @younesbelkada and @sgugger ? :smiley_cat: 

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Models:

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- tokenizers: @n1t0, @LysandreJik
- trainer: @sgugger
- pipelines: @LysandreJik

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Comments:
_The documentation is not available anymore as the PR was closed or merged._