[FIX] document: PDF indexing
[FIX] document: PDF indexing

Backport from 12.0, commit : 1b753b0d53744a6e95467c6bd128ead0edb273cc
note: there was also report of PDF content blocking that when indexed
blocked an instance worker indefinitely

Since PyPDF2 gives bad results for PDF indexing, stop using it since it
raises more issues than it helps users.

opw-2044679

closes odoo/odoo#35310

closes odoo/odoo#35525

Signed-off-by: Jorge Pinna Puissant (jpp) <52c05351c1e024f822a0ec03b4a6cce073666ac8@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo