Fixed stale URL references

[bandish-shah]

Description of changes:

When we changed the docs URL from docs.mosaicml.com/projects/streaming to streaming.docs.mosaicml.com, this broke several hard coded links. This PR fixes those dead links and updates them to point to the updated URL.

Merge Checklist:

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[karan6181]

LGTM! Thank you for fixing it quickly!