📝 Remove male pronoun in comment

[ci skip]

Author: mctaylorpants

lib/react/jsx/jsx_transformer.rb

@@ -24,7 +24,7 @@ def transform(code)
       end
 
       # search for transformer file using sprockets - allows user to override
-      # this file in his own application
+      # this file in their own application
       def jsx_transform_code
         ::Rails.application.assets[@asset_path].to_s
       end