python_3_support.rst: fix broken links (#33951)
python_3_support.rst: fix broken links (#33951)

The links pointing to 'Building From Source' and 'Inventory' were not
valid, so I updated them to point to locations that seemed
appropriate.

Signed-off-by: Micah Abbott <5994877adc9ac69035af1f2df439b774406830a8@redhat.com>
thaim/ansible,thaim/ansible