Corrections for a/an in code comments and documentation
diff --git a/Include/memoryobject.h b/Include/memoryobject.h
index bf0b621..e6a5c45 100644
--- a/Include/memoryobject.h
+++ b/Include/memoryobject.h
@@ -33,7 +33,7 @@
        original buffer if a copy must be made.  If buffertype is
        PyBUF_WRITE and the buffer is not contiguous an error will
        be raised.  In this circumstance, the user can use
-       PyBUF_SHADOW to ensure that a a writable temporary
+       PyBUF_SHADOW to ensure that a writable temporary
        contiguous buffer is returned.  The contents of this
        contiguous buffer will be copied back into the original
        object after the memoryview object is deleted as long as
diff --git a/Include/pythonrun.h b/Include/pythonrun.h
index 2151dda..cfb02b0 100644
--- a/Include/pythonrun.h
+++ b/Include/pythonrun.h
@@ -155,7 +155,7 @@
 
 /* Stack size, in "pointers" (so we get extra safety margins
    on 64-bit platforms).  On a 32-bit platform, this translates
-   to a 8k margin. */
+   to an 8k margin. */
 #define PYOS_STACK_MARGIN 2048
 
 #if defined(WIN32) && !defined(MS_WIN64) && defined(_MSC_VER) && _MSC_VER >= 1300