Imported Upstream version 6.6.0.89

Former-commit-id: b39a328747c2f3414dc52e009fb6f0aa80ca2492

external/api-doc-tools/mdoc/mdoc.Test/mdoc.Test.FSharp/NestedModules.fs

@@ -0,0 +1,13 @@
+module NestedModules
+
+// Modules can be nested. Inner modules must be indented as far as outer module declarations 
+// to indicate that they are inner modules, not new modules. 
+module Y =
+    let y = 1
+
+    [<AutoOpen>]
+    module Z =
+        let z = 5
+
+module X =
+    let x = 2