Merge branch 'doc/multidomain-intro' into 'master'

Hamza Oukilirequested to merge
cherry-pick-b63068c2 into releases/3.7

[doc] multidomain introduction

See merge request !148 (merged)

(cherry picked from commit b63068c2)

c3a0d6aa [slides][css] make code font smaller 91d9cdb0 [doc] multidomain introduction a17bfc60 [slides][multidomain] minor changes

Merge request reports