Update cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DebugPrinting.qll

Co-authored-by: Jeroen Ketema <93738568+jketema@users.noreply.github.com>

Author: MathiasVP

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DebugPrinting.qll

@@ -1,5 +1,5 @@
 /**
- * This file contains module that implements the _debug_ version of
+ * This file contains a module that implements the _debug_ version of
  * `toString` for `Instruction` and `Operand` dataflow nodes.
  */