Issue #16341: convert examples to use except ... as ... syntax.

Doc/includes/email-unpack.py

@@ -35,7 +35,7 @@ Usage: %prog [options] msgfile
 
     try:
         os.mkdir(opts.directory)
-    except OSError, e:
+    except OSError as e:
         # Ignore directory exists error
         if e.errno != errno.EEXIST:
             raise

Doc/includes/sqlite3/complete_statement.py

@@ -23,7 +23,7 @@ while True:
 
             if buffer.lstrip().upper().startswith("SELECT"):
                 print cur.fetchall()
-        except sqlite3.Error, e:
+        except sqlite3.Error as e:
             print "An error occurred:", e.args[0]
         buffer = ""