Update STYLE_GUIDE.md

Co-Authored-By: Milan Curcic <[email protected]>

STYLE_GUIDE.md

@@ -28,7 +28,7 @@ focus on the semantics of the proposed changes rather than style and formatting.
 * __Indentation__: __Four (4) spaces__ for all control constructs, line continuations, etc.
 * __Line ending character__: __Native__: Git will convert line endings to `\n` (Unix style) on commit, and will checkout files with native line endings
 
-## Variable naming
+## Variable and procedure naming
 
 Variable names should be descriptive, and not artificially short.
 By default, where it makes sense to do so, variable names shall be made up of one or more full words separated by an underscore.