Sync test_plistlib.py with plistlib.py

Lib/test/test_plistlib.py

@@ -9,7 +9,7 @@ from test import test_support
 
 # This test data was generated through Cocoa's NSDictionary class
 TESTDATA = """<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" \
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" \
 "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>