Fix spelling.

Modules/_sqlite/cursor.c

@@ -621,7 +621,7 @@ PyObject* _query_execute(Cursor* self, int multiple, PyObject* args)
                 }
             } else {
                 if (PyErr_Occurred()) {
-                    /* there was an error that occured in a user-defined callback */
+                    /* there was an error that occurred in a user-defined callback */
                     if (_enable_callback_tracebacks) {
                         PyErr_Print();
                     } else {

Modules/_sqlite/util.c

@@ -38,7 +38,7 @@ int _sqlite_step_with_busyhandler(sqlite3_stmt* statement, Connection* connectio
 
 /**
  * Checks the SQLite error code and sets the appropriate DB-API exception.
- * Returns the error code (0 means no error occured).
+ * Returns the error code (0 means no error occurred).
  */
 int _seterror(sqlite3* db)
 {

Modules/_sqlite/util.h

@@ -32,7 +32,7 @@ int _sqlite_step_with_busyhandler(sqlite3_stmt* statement, Connection* connectio
 
 /**
  * Checks the SQLite error code and sets the appropriate DB-API exception.
- * Returns the error code (0 means no error occured).
+ * Returns the error code (0 means no error occurred).
  */
 int _seterror(sqlite3* db);
 #endif

Modules/socketmodule.c

@@ -2307,7 +2307,7 @@ sock_recv(PySocketSockObject *s, PyObject *args)
 	/* Call the guts */
 	outlen = sock_recv_guts(s, PyString_AS_STRING(buf), recvlen, flags);
 	if (outlen < 0) {
-		/* An error occured, release the string and return an
+		/* An error occurred, release the string and return an
 		   error. */
 		Py_DECREF(buf);
 		return NULL;