Different code editors do have different keyboard shortcuts to do Capitalize, Uppercase and Lowercase of text. Generally, i use EditPlus as code editor which has shortcuts for uppercase and lowercase but it does not seem to have a shortcut or even option to do capitalization of text content. Invent of this tool resulted from this particular necessity :)
Please post keyboard shortcuts to these three actions in your favorite code editor and we will include those in this page. Also if you know about how to do capitalization of text in EditPlus please do share as a comment.