Commentary: Fix spelling in C++ comments (#3797) (#3798)

src/V3Gate.cpp

@@ -785,7 +785,7 @@ private:
     std::unordered_set<AstNode*> m_nodeDeleteds;  // Any node in this hash was deleted
 
     bool same(AstNode* node1p, AstNode* node2p) {
-        // Regarding the complexity of this funcition 'same':
+        // Regarding the complexity of this function 'same':
         // Applying this comparison function to a a set of n trees pairwise is O(n^2) in the
         // number of comparisons (number of pairs). AstNode::sameTree itself, is O(sizeOfTree) in
         // the worst case, which happens if the operands of sameTree are indeed identical copies,