docs: Multi-fact view (cube-js#10628)

* docs: Multi-fact view

* Join semantics and date trunc

* Join path requirements

Author: paveltiunov

docs-mintlify/docs.json

@@ -82,6 +82,7 @@
                   "docs/data-modeling/concepts/working-with-joins",
                   "docs/data-modeling/concepts/code-reusability-extending-cubes",
                   "docs/data-modeling/concepts/polymorphic-cubes",
+                  "docs/data-modeling/concepts/multi-fact-queries",
                   "docs/data-modeling/concepts/data-blending"
                 ]
               },