[IMP] reference/payment_provider: remove _should_build_inline_form method

Docs updated to reflect current payment form behavior.

task-4911075

closes #14754

Related: odoo/odoo#229541
Signed-off-by: Antoine Vandevenne (anv) <[email protected]>

Author: csan-odoo

content/developer/reference/standard_modules/payment/payment_provider.rst

@@ -23,4 +23,3 @@ Payment Provider
    .. automethod:: _parse_response_content
    .. automethod:: _parse_response_error
    .. automethod:: _send_api_request
-   .. automethod:: _should_build_inline_form