weird anchors for CL_MEM_OBJECT_IMAGE1D, etc.

[bashbaug]

Editorial:

The current anchors for CL_MEM_OBJECT_IMAGE1D and similar image types are a little weird, linking to "Table 23. Required host_ptr buffer sizes for images". I think it would make more sense to link to one of the following locations, instead:

• The descriptions in the "image_type" field in the image descriptor structure.
• The descriptions for the CL_MEM_TYPE query from clGetMemObjectInfo.