minor #12384 Doc: Fix Doctrine project url (n3wborn)
minor #12384 Doc: Fix Doctrine project url (n3wborn)

This PR was merged into the 1.8 branch.

Discussion
----------

Into "architecture overview", replace Doctrine "About" URL pointed to a "Page Not Found"

| Q               | A
| --------------- | -----
| Branch?         |  master
| Bug fix?        | no
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | no
| Related tickets | 
| License         | MIT

<!--
 - Bug fixes must be submitted against the 1.7 or 1.8 branch (the lowest possible)
 - Features and deprecations must be submitted against the master branch
 - Make sure that the correct base branch is set

 To be sure you are not breaking any Backward Compatibilities, check the documentation:
 https://docs.sylius.com/en/latest/book/organization/backward-compatibility-promise.html
-->


Commits
-------

f3afca3545e95ef67e25080d6b9c3a0b0446d2db Fix Doctrine project url

Sylius/Sylius,Sylius/Sylius,lchrusciel/Sylius,Zales0123/Sylius,SyliusBot/Sylius,lchrusciel/Sylius,GSadee/Sylius,Sylius/Sylius,antonioperic/Sylius,GSadee/Sylius,GSadee/Sylius,SyliusBot/Sylius,Zales0123/Sylius,Arminek/Sylius,101medialab/Sylius,pamil/Sylius,Arminek/Sylius,loic425/Sylius,lchrusciel/Sylius,diimpp/Sylius,101medialab/Sylius,pamil/Sylius,diimpp/Sylius,loic425/Sylius,pamil/Sylius,Zales0123/Sylius,antonioperic/Sylius,Arminek/Sylius,101medialab/Sylius,loic425/Sylius,diimpp/Sylius,antonioperic/Sylius,SyliusBot/Sylius