Typos. Fixes #415.

CHANGES.rst

@@ -196,7 +196,7 @@ Known Issues
 =====================
 
 - Linux: Fix another group of rare crashes that could occur when shutting down an
-  interpeter running multiple threads. See `issue 325 <https://github.com/python-greenlet/greenlet/issues/325>`_.
+  interpreter running multiple threads. See `issue 325 <https://github.com/python-greenlet/greenlet/issues/325>`_.
 
 
 2.0.0rc4 (2022-10-30)

src/greenlet/TThreadStateDestroy.cpp

@@ -139,7 +139,7 @@ struct ThreadState_DestroyNoGIL
 
         // NOTE: Because we're not holding the GIL here, some other
         // Python thread could run and call ``os.fork()``, which would
-        // be bad if that happenend while we are holding the cleanup
+        // be bad if that happened while we are holding the cleanup
         // lock (it wouldn't function in the child process).
         // Make a best effort to try to keep the duration we hold the
         // lock short.

src/greenlet/greenlet.cpp

@@ -1220,7 +1220,7 @@ mod_gettrace(PyObject* UNUSED(module))
 PyDoc_STRVAR(mod_set_thread_local_doc,
              "set_thread_local(key, value) -> None\n"
              "\n"
-             "Set a value in the current thread-local dictionary. Debbuging only.\n");
+             "Set a value in the current thread-local dictionary. Debugging only.\n");
 
 static PyObject*
 mod_set_thread_local(PyObject* UNUSED(module), PyObject* args)