Trivial typos

Non-user facing. 
Found using `codespell -q 3`
diff --git a/tests/test_virtual_functions.cpp b/tests/test_virtual_functions.cpp
index 953b390..336f5e4 100644
--- a/tests/test_virtual_functions.cpp
+++ b/tests/test_virtual_functions.cpp
@@ -249,7 +249,7 @@
     m.def("dispatch_issue_go", [](const Base * b) { return b->dispatch(); });
 
     // test_override_ref
-    // #392/397: overridding reference-returning functions
+    // #392/397: overriding reference-returning functions
     class OverrideTest {
     public:
         struct A { std::string value = "hi"; };