Inconsistent enum labeling for `cl_khr_dx9_media_sharing` enums

In [cl_khr_dx9_media_sharing](https://github.com/KhronosGroup/OpenCL-Docs/blob/main/api/cl_khr_dx9_media_sharing.asciidoc) the following enum constants are defined as being part of the `cl_context_info` enumeration.

But looking at https://github.com/KhronosGroup/OpenCL-Docs/blob/main/man/static/enums.txt which documents all valid enum values for each enumeration these values seem to be listed under `cl_context_properties`.

However, in `cl.xml` these enums are included under a `cl_context_info` comment.
https://github.com/KhronosGroup/OpenCL-Docs/blob/main/xml/cl.xml#L5914-L5917

It does seem likely from [other specification wording](https://registry.khronos.org/OpenCL/specs/unified/refpages/man/html/clCreateContextFromType.html#:~:text=CL_INVALID_DX9_MEDIA_,created%20may%20interoperate) that the correct enum is indeed `cl_context_properties` but it's a little hard to know.

If the `cl_khr_dx9_media_sharing` file is wrong it and `cl.xml` should be updated to reflect the correct enumeration for these values.

Compare the enum definitions in api/cl_khr_dx9_media_sharing.asciidoc, the entries in man/static/enums.txt, and the cl_context_info comment in xml/cl.xml. Check the linked clCreateContextFromType wording to determine the correct enumeration, then update the inconsistent documentation sources so all three agree.

Written by the indexing model from the issue text.