Fix typos

Author: JordanMartinez

src/Data/Symbol.purs

@@ -16,7 +16,7 @@ class IsSymbol (sym :: Symbol) where
   -- Note: Before v0.14.0, we did not have polykinds. Thus, we needed
   -- kind-specific proxy types to pass a Symbol around.
   -- Once v0.14.0 was released, we could use the kind-generic `Proxy` type
-  -- insteand. However, to reduce the code breakage, we're using
+  -- instead. However, to reduce code breakage, we're using
   -- `forall proxy. proxy sym` here so that `SProxy` code will still compile.
   -- When PureScript makes a new breaking release after the v0.14.0 release,
   -- this type signature will be updated to `Proxy sym -> String`.