doc: fix required tools list layout in Linux guide
doc: fix required tools list layout in Linux guide

The Python requirement should appear in the bullet list.

Also, indent the x32 note, since it is related to the previous bullet.

Signed-off-by: Baruch Siach <53ccad33e0625915318fb3bc832e5c1c413d1294@tkos.co.il>
Acked-by: John McNamara <af31595c36a4239b9676e9b3a777d3e2f15a6c4d@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk