Prefix files with "_" for files wich must be exclude from controls Reference/ReStructuredText/Code/Codeblocks.html

[jonirouAtTalan]

It should be good to :

• prefix files names
• explain why we need to prefix with "_"

Current behavior

We don't know that we have to prefix with "_" and why

Expected behavior/output

Adding "_" prefix and explain why in TYPO3 documentation process