Tests: Fix commentary to unify issue references.

src/V3AstNodes.cpp

@@ -2317,7 +2317,7 @@ void AstCAwait::dump(std::ostream& str) const {
 int AstCMethodHard::instrCount() const {
     if (AstBasicDType* const basicp = fromp()->dtypep()->basicp()) {
         // TODO: add a more structured description of library methods, rather than using string
-        //       matching. See #3715.
+        //       matching. See issue #3715.
         if (basicp->isTriggerVec() && m_name == "word") {
             // This is an important special case for scheduling so we compute it precisely,
             // it is simply a load.

src/V3Global.h

@@ -102,7 +102,7 @@ class V3Global final {
     bool m_assertDTypesResolved = false;  // Tree should have dtypep()'s
     bool m_assertScoped = false;  // Tree is scoped
     bool m_constRemoveXs = false;  // Const needs to strip any Xs
-    // Experimenting with always requiring heavy, see (#2701)
+    // Experimenting with always requiring heavy, see issue #2701
     bool m_needTraceDumper = false;  // Need __Vm_dumperp in symbols
     bool m_dpi = false;  // Need __Dpi include files
     bool m_hasEvents = false;  // Design uses SystemVerilog named events

src/V3Partition.cpp

@@ -1974,7 +1974,7 @@ private:
         }
         // Not: Find all reader tasks for this variable, group by rank.
         // There was "broken" code here to find readers, but fixing it to
-        // work properly harmed performance on some tests, see #3360.
+        // work properly harmed performance on some tests, see issue #3360.
     }
     void mergeSameRankTasks(const TasksByRank& tasksByRank) {
         LogicMTask* lastRecipientp = nullptr;