Merge pull request rescript-lang#1589 from mgmcdermott/patch-1

fix typo in boolean error

Author: bobzhang

jscomp/common/bs_warnings.ml

@@ -39,7 +39,7 @@ let to_string t =
   match t with
   | Unsafe_ffi_bool_type
     ->   
-    "You are passing a OCaml bool type into JS, probabaly you want to pass Js.boolean"
+    "You are passing a OCaml bool type into JS, probably you want to pass Js.boolean"
   | Unsafe_poly_variant_type 
     -> 
     "Here a OCaml polymorphic variant type passed into JS, probably you forgot annotations like `[@bs.int]` or `[@bs.string]`  "