minor typo fix

Author: stmuk

doc/Language/regexes.pod6

@@ -1134,7 +1134,7 @@ doing, refer to the L<section Adverbs|#Adverbs> section of this document.
 
 These are just a few of the transformations you can apply with the substitution
 operator. Some of the simpler uses in the real world include removing personal
-data from log files, editing mySQL timestamps into PostgreSQL format, changing
+data from log files, editing MySQL timestamps into PostgreSQL format, changing
 copyright information in HTML files and sanitizing form fields in a web
 application.