Documentation: sphinx: replace "Introduction" chapter heading with page title

Replace first chapter heading ("Introduction") with page title named
"Using Sphinx for kernel documentation". This way, the first-level TOC
for doc-guide contains title instead of chapter headings for this page.

Cc: Jonathan Corbet <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Tony Nguyen <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Akira Yokosawa <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: [email protected]
Reviewed-by: Mauro Carvalho Chehab <[email protected]>
Signed-off-by: Bagas Sanjaya <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

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