Speling.

include/ExtensionClass/ExtensionClass.h

@@ -212,7 +212,7 @@ static PyExtensionClass NAME ## Type = { PyObject_HEAD_INIT(NULL) 0, # NAME, \
 (PyMethod_Check((M)) ? ((PyMethodObject*)(M))->im_self : NULL)
 
 /* Check whether an object has an __of__ method for returning itself
-   in the context of it's container. */
+   in the context of its container. */
 #define has__of__(O) (PyObject_TypeCheck((O)->ob_type, ECExtensionClassType) \
                       && (O)->ob_type->tp_descr_get != NULL)
 

src/AccessControl/SpecialUsers.py

@@ -13,7 +13,7 @@
 """Place to find special users
 
 This is needed to avoid a circular import problem.  The 'real' values
-are stored here by the AccessControl.User module as part of it's
+are stored here by the AccessControl.User module as part of its
 initialization.
 """
 

src/AccessControl/cAccessControl.c

@@ -871,7 +871,7 @@ static PyObject *ZopeSecurityPolicy_validate(PyObject *self, PyObject *args) {
 		/*| # We have an object without roles and we didn't get
 		**| # a list of roles passed in.  Presumably, the value
 		**| # is some simple object like a string or a list.
-		**| # We'll try to get roles from it's container
+		**| # We'll try to get roles from its container
 		**|
 		**| if container is None: raise Unauthorized(name, value)
 		*/