fix typo

Author: ajjahn

lib/react/component/class_methods.rb

@@ -79,9 +79,9 @@ def param(*args)
 
       def collect_other_params_as(name)
         validator.allow_undefined_props = true
-        validator_in_lexial_scope = validator
+        validator_in_lexical_scope = validator
         props_wrapper.define_method(name) do
-          @_all_others ||= validator_in_lexial_scope.undefined_props(props)
+          @_all_others ||= validator_in_lexical_scope.undefined_props(props)
         end
       end