Add documentation for XML_FreeContentModel(), XML_MemMalloc(), XML_MemRealloc(), and XML_MemFree().
Add documentation for XML_FreeContentModel(), XML_MemMalloc(),
XML_MemRealloc(), and XML_MemFree().

cgwalters/expat-git-mirror,cgwalters/expat-git-mirror,cgwalters/expat-git-mirror