Update docs/codeql/codeql-language-guides/analyzing-data-flow-in-cpp-new.rst

Co-authored-by: Ben Ahmady <32935794+subatoi@users.noreply.github.com>

Author: jketema

docs/codeql/codeql-language-guides/analyzing-data-flow-in-cpp-new.rst

@@ -89,7 +89,7 @@ For example, finding taint propagation from a parameter ``source`` to an express
 Examples
 ~~~~~~~~
 
-The following query finds the filename passed to ``fopen``.
+The following query finds the filename passed to ``fopen``:
 
 .. code-block:: ql