docs: networking: fix indentation errors in multi-pf-netdev

docs: networking: fix indentation errors in multi-pf-netdev

Stephen reports new warnings in the docs:

Documentation/networking/multi-pf-netdev.rst:94: ERROR: Unexpected indentation.
Documentation/networking/multi-pf-netdev.rst:106: ERROR: Unexpected indentation.

Fixes: 77d9ec3f6c8c ("Documentation: networking: Add description for multi-pf netdev")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/all/20240312153304.0ef1b78e@canb.auug.org.au/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20240313032329.3919036-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>