Document that ResolvedPath can also be a union

Author: aDotInTheVoid

src/rustdoc-json-types/lib.rs

@@ -542,7 +542,7 @@ pub enum Term {
 #[serde(rename_all = "snake_case")]
 #[serde(tag = "kind", content = "inner")]
 pub enum Type {
-    /// Structs and enums
+    /// Structs, enums, and unions
     ResolvedPath(Path),
     DynTrait(DynTrait),
     /// Parameterized types

src/test/rustdoc-json/unions/union.rs

@@ -1,7 +1,15 @@
 // @has "$.index[*][?(@.name=='Union')].visibility" \"public\"
 // @has "$.index[*][?(@.name=='Union')].kind" \"union\"
 // @!has "$.index[*][?(@.name=='Union')].inner.struct_type"
+// @set Union = "$.index[*][?(@.name=='Union')].id"
 pub union Union {
     int: i32,
     float: f32,
 }
+
+
+// @is "$.index[*][?(@.name=='make_int_union')].inner.decl.output.kind" '"resolved_path"'
+// @is "$.index[*][?(@.name=='make_int_union')].inner.decl.output.inner.id" $Union
+pub fn make_int_union(int: i32) -> Union {
+    Union { int }
+}