misc. typos

Found via `codespell`
diff --git a/tests/test_exceptions.cpp b/tests/test_exceptions.cpp
index ae28abb..cf20214 100644
--- a/tests/test_exceptions.cpp
+++ b/tests/test_exceptions.cpp
@@ -9,7 +9,7 @@
 
 #include "pybind11_tests.h"
 
-// A type that should be raised as an exeption in Python
+// A type that should be raised as an exception in Python
 class MyException : public std::exception {
 public:
     explicit MyException(const char * m) : message{m} {}
diff --git a/tests/test_operator_overloading.py b/tests/test_operator_overloading.py
index 0d80e5e..86827d2 100644
--- a/tests/test_operator_overloading.py
+++ b/tests/test_operator_overloading.py
@@ -98,7 +98,7 @@
 
     del c
     pytest.gc_collect()
-    del a  # Should't delete while abase is still alive
+    del a  # Shouldn't delete while abase is still alive
     pytest.gc_collect()
 
     assert abase.value == 42