Update doc_rules/elvis_style/variable_naming_convention.md

Co-authored-by: Paulo F. Oliveira <[email protected]>

doc_rules/elvis_style/variable_naming_convention.md

@@ -1,7 +1,7 @@
 # Variable Naming Convention
 
-All variables should be named according to the regular expression provided.
-Except if it matches with a defined `forbidden_regex`.
+All variables should be named according to the provided regular expression,
+except if they match with a defined `forbidden_regex`.
 
 > Works on `.beam` file? Yes!