Update contributing/code/stack_trace.rst

Co-authored-by: Antoine Makdessi <antoine.makdessi@agriconomie.com>

Author: greg0ire

contributing/code/stack_trace.rst

@@ -5,7 +5,7 @@ When :doc:`reporting a bug </contributing/code/bugs>` for an
 exception or a wrong behavior in code, it is crucial that you provide
 one or several stack traces. To understand why, you first have to
 understand what a stack trace is, and how it can be useful to you as a
-developer, and to library maintainers.
+developer, and also to library maintainers.
 
 Anatomy of a Stack Trace
 ------------------------