Update index.rst

[Tribhuvan0]

What does this PR do?

On the glossary page, it changes the orientation of mount entry so that it can align with all other cards

Go to the Glossary page: https://lightning.ai/docs/app/stable/glossary/

Scroll down to the Mounts entry on the page. The formatting is incorrect.

I changed the code to align the mount entry
This is how it looked earier:

Fixes #17698

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📚 Documentation preview 📚: https://pytorch-lightning--18502.org.readthedocs.build/en/18502/

[awaelchli]

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