[FIX] payment_paypal: documentation link

The Paypal URL doesn't exist anymore. Redirect to Odoo documentation
instead.

opw-697606

addons/payment_paypal/views/payment_acquirer.xml

@@ -15,7 +15,7 @@
                         <field name="paypal_api_enabled" invisible="1"/>
                         <field name="paypal_api_username" invisible="1"/>
                         <field name="paypal_api_password" invisible="1"/>
-                        <a colspan="2" href="https://www.paypal.com/in/cgi-bin/webscr?cmd=xpt/Marketing/general/how-to-set-up-a-paypal-account-outside" target="_blank">How to configure your paypal account?</a>
+                        <a colspan="2" href="https://www.odoo.com/documentation/user/online/ecommerce/shopper_experience/paypal.html" target="_blank">How to configure your paypal account?</a>
                     </group>
                 </xpath>
             </field>