minor #10617 Provide an upgrade guide for v1.6.0 (pamil)
minor #10617 Provide an upgrade guide for v1.6.0 (pamil)

This PR was merged into the 1.6-dev branch.

Discussion
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Commits
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d13647b31fc16bc16ed59aa167322709517047fa Provide an upgrade guide for v1.6.0

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