docs: Added documentation to use SuryaOCR via plugin docling-surya (#2533)

* docs: Added documentation to use SuryaOCR via plugin `docling-surya`

Signed-off-by: Harry Ho <kho7@student.umgc.edu>

* Add PyPI link for docling-surya package

Added a link to the PyPI page for docling-surya.

Signed-off-by: Harry Ho <4719770+harrykhh@users.noreply.github.com>

* Add licensing note for SuryaOCR integration

Added important licensing note regarding SuryaOCR integration. 

Signed-off-by: Harry Ho <4719770+harrykhh@users.noreply.github.com>

* Ran linter to reformat

Signed-off-by: Harry Ho <4719770+harrykhh@users.noreply.github.com>

---------

Signed-off-by: Harry Ho <kho7@student.umgc.edu>
Signed-off-by: Harry Ho <4719770+harrykhh@users.noreply.github.com>
Co-authored-by: Harry Ho <kho7@student.umgc.edu>