Spring Fix LocaleEditor description and formatting in reference manual

The official documentation contains incorrect description of LocaleEditor class (page 244 of pdf): 1) The language part is missing. The problem lies in incorrect formatting. 2) We can also use spaces as separators instead of underscores. We can see it from source code of StringUtils class.

Comment From: sbrannen

Good catch on the invalid formatting. 👍

This has been merged into master.

Thanks