fix: typo in conceptual-overview.rst (#93)

from "... the could would look like this:"
to "... the code would look like this:"

Author: Alvynskio

docs/intro/conceptual-overview.rst

@@ -6,7 +6,7 @@ Conceptual Overview
 
 To justify the value of TLA+, let's talk about how it's useful, and how it's different from programming languages.
 
-Imagine we're building a wire transfer service for a bank. Users can make transfers to other users. As a requirement, we don't allow any wires that would overdraft the user's account, or make it go below zero dollars. At a high level, the could would look like this:
+Imagine we're building a wire transfer service for a bank. Users can make transfers to other users. As a requirement, we don't allow any wires that would overdraft the user's account, or make it go below zero dollars. At a high level, the code would look like this:
 
 .. code-block::