bug #10359 [Docs] Update "Customizing Grids" (Tomanhez)
bug #10359 [Docs] Update "Customizing Grids" (Tomanhez)

This PR was merged into the 1.3 branch.

Discussion
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| Q               | A
| --------------- | -----
| Branch?         | 1.3
| Bug fix?        | yes
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | no
| License         | MIT


Commits
-------

a6e9ef2bf7f4119619ca51fa7e7ede10a3ba5eda update customizing grids

mbabker/Sylius,pjedrzejewski/Sylius,101medialab/Sylius,SyliusBot/Sylius,loic425/Sylius,mbabker/Sylius,foobarflies/Sylius,pamil/Sylius,pjedrzejewski/Sylius,antonioperic/Sylius,kayue/Sylius,Arminek/Sylius,itinance/Sylius,GSadee/Sylius,foobarflies/Sylius,101medialab/Sylius,itinance/Sylius,itinance/Sylius,Zales0123/Sylius,Brille24/Sylius,diimpp/Sylius,Zales0123/Sylius,loic425/Sylius,SyliusBot/Sylius,kayue/Sylius,loic425/Sylius,mbabker/Sylius,Sylius/Sylius,Brille24/Sylius,Sylius/Sylius,pamil/Sylius,pjedrzejewski/Sylius,kayue/Sylius,Arminek/Sylius,lchrusciel/Sylius,Brille24/Sylius,mbabker/Sylius,GSadee/Sylius,Zales0123/Sylius,Brille24/Sylius,antonioperic/Sylius,101medialab/Sylius,pamil/Sylius,antonioperic/Sylius,lchrusciel/Sylius,GSadee/Sylius,Sylius/Sylius,diimpp/Sylius,SyliusBot/Sylius,pjedrzejewski/Sylius,foobarflies/Sylius,itinance/Sylius,lchrusciel/Sylius,diimpp/Sylius,foobarflies/Sylius,Arminek/Sylius