C++: Clarify doc comment and make build-mode: nonereferences more consistent.

Author: geoffw0

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

@@ -526,8 +526,8 @@ class Function extends Declaration, ControlFlowNode, AccessHolder, @function {
   }
 
   /**
-   * Holds if this function has ambiguous return type (this occurs sometimes in
-   * Build Mode None).
+   * Holds if this function has an ambiguous return type, meaning that zero or multiple return
+   * types for this function are present in the database (this can occur in `build-mode: none`).
    */
   predicate hasAmbiguousReturnType() {
     count(this.getType()) != 1

cpp/ql/src/change-notes/2026-03-11-integer-multiplication-cast-to-long.md

@@ -1,4 +1,4 @@
 ---
 category: minorAnalysis
 ---
-* Fixed an issue with the "Multiplication result converted to larger type" (`cpp/integer-multiplication-cast-to-long`) query causing false positive results in Build Mode Node databases.
+* Fixed an issue with the "Multiplication result converted to larger type" (`cpp/integer-multiplication-cast-to-long`) query causing false positive results in `build-mode: none` databases.