feat: distributed + fix codegen

docs/src/api/sharding.md

@@ -12,3 +12,13 @@ Currently we haven't documented all the functions in `Reactant.Sharding`.
 ```@autodocs
 Modules = [Reactant.Sharding]
 ```
+
+# [Distributed API](@id distributed-api)
+
+`Reactant.Distributed` module provides a high-level API to run reactant on multiple hosts.
+
+Currently we haven't documented all the functions in `Reactant.Distributed`.
+
+```@autodocs
+Modules = [Reactant.Distributed]
+```