minor #7957 Minor reword of code contribution standards (javiereguiluz)

This PR was merged into the 2.7 branch.

Discussion
----------

Minor reword of code contribution standards

This fixes #7956.

Commits
-------

1426a10 Minor reword of code contribution standards

Author: xabbuh

contributing/code/standards.rst

@@ -186,7 +186,7 @@ Naming Conventions
 * Use camelCase, not underscores, for variable, function and method
   names, arguments;
 
-* Use underscores for option names and parameter names;
+* Use underscores for configuration options and parameters;
 
 * Use namespaces for all classes;