Update resources/type-system/inference.md

Co-authored-by: Erik Ernst <eernst@google.com>

Author: lrhn

resources/type-system/inference.md

@@ -331,7 +331,7 @@ schema.
     for each `return e;` statement in the block, let `S` be the inferred type
     of `e`, using the local type inference algorithm described below with typing
     context `K`, and update `T` to be `UP(S, T)`.
-  - If the enclosing function is marekd `async`, for each `return e;` statement
+  - If the enclosing function is marked `async`, for each `return e;` statement
     in the block, let `S` be the inferred type of `e`, using the local type
     inference algorithm described below with typing context `FutureOr<K>`,
     and update `T` to be `UP(flatten(S), T)`.