remove another link to JS

Author: jderochervlk

pages/docs/manual/v12.0.0/api.mdx

@@ -10,5 +10,5 @@ In ReScript 11, it is shipped as a separate npm package `@rescript/core` that is
 
 ReScript ships with these two additional modules in its standard library:
 
-- [Belt](api/belt): immutable collections and extra helpers not available in JavaScript / [Core](api/core).
+- [Belt](api/belt): immutable collections and extra helpers not available in [Core](api/core).
 - [Dom](api/dom): Dom related types and modules. Contains our standardized types used by various userland DOM bindings.