Python: Update description of CodeInjection

Co-authored-by: intrigus-lgtm <60750685+intrigus-lgtm@users.noreply.github.com>

Author: RasmusWL

python/ql/src/experimental/Security-new-dataflow/CWE-094/CodeInjection.ql

@@ -1,6 +1,6 @@
 /**
  * @name Code injection
- * @description Interpreting unsanitized user input as code allows a malicious user arbitrary
+ * @description Interpreting unsanitized user input as code allows a malicious user to perform arbitrary
  *              code execution.
  * @kind path-problem
  * @problem.severity error