C++: Fix QL-for-QL warning

Author: jketema

cpp/ql/lib/semmle/code/cpp/Compilation.qll

@@ -100,10 +100,12 @@ class Compilation extends @compilation {
   string getAnExpandedArgument() { result = this.getArgument(_) }
 
   /**
-   * The expanded arguments that were passed to the extractor for a
-   * compiler invocation. This is similar to `getArgument`, but
-   * for a `@someFile` argument, it includes the arguments from that
-   * file, rather than just taking the argument literally.
+   * Gets the `i`th expanded argument passed to the extractor on this
+   * invocation.
+   *
+   * This is similar to `getArgument`, but for a `@someFile` argument, it
+   * includes the arguments from that file, rather than just taking the
+   * argument literally.
    */
   string getExpandedArgument(int i) { compilation_expanded_args(this, i, result) }