chore: Update Documentation of Extractors

[ritwikraha]

Continuation of: https://github.com/tensorlakeai/indexify/pull/718

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Name	Status	Preview	Comments	Updated (UTC)
indexify	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 10, 2024 9:48am

[ritwikraha]

cc: @diptanu this is up for review again