English cleanups in programming guide

The following paragraph:

If C++ Namespace support is ENABLED (all the binary distributions of Xerces-C++
2.5.0 are built with C++ Namespace enabled), users' applications must namespace
qualified all the Xerces-C++ classes/data/variables with "xercesc::" or add the
"using namespace xercesc" clause. Users also need to ensure all forward
declarations are properly qualified or scope. For example

should read:

If C++ Namespace support is ENABLED (all the binary distributions of Xerces-C++
2.5.0 are built with C++ Namespace enabled), users' applications must namespace
qualify all the Xerces-C++ classes/data/variables with "xercesc::" or add the
"using namespace xercesc" clause. Users also need to ensure all forward
declarations are properly qualified or scoped. For example