Enhancement: Improve guessing the URL to the latest refpages version

Followup on https://github.com/KhronosGroup/OpenCL-Docs/issues/251

@Khronoswebmaster
Minor issue:

I guess you added some kind of link (named `latest`) to the www.khronos.org/registry/OpenCL/sdk/ folder, that redirects to the `2.2` folder.

In the same way, could you add a link named `xhtml` to the www.khronos.org/registry/OpenCL/sdk/2.2/docs/man/ folder, that redirects to the `html` folder?

This way, if one does not have a "latest" link, one can simply change the version number to `latest`, and it works. If one currently changes the version number in an old link to `latest`, one gets redirected, to an inexistent location.

Example:

Some link led me to this webpage:
www.khronos.org/registry/OpenCL/sdk/1.0/docs/man/xhtml/clGetDeviceIDs.html

Assuming I am a somewhat "technologically affine" person, I think "oh, maybe there is a newer version available, let's try changing the version number in the URL to `latest`" (yes, this strategy works quite often) - I then get the URL:
www.khronos.org/registry/OpenCL/sdk/latest/docs/man/xhtml/clGetDeviceIDs.html

That link automatically redirects to the invalid location:
www.khronos.org/registry/OpenCL/sdk/2.2/docs/man/xhtml/clGetDeviceIDs.html

If the `xhtml` folder would now automatically redirect to `html`, it would have worked.

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For the same reason (guessing the URL), could you redirect www.khronos.org/registry/OpenCL/sdk/docs/ to www.khronos.org/registry/OpenCL/sdk/latest/docs/ ?
If one removes the version number from
www.khronos.org/registry/OpenCL/sdk/1.0/docs/man/xhtml/clGetDeviceIDs.html
one gets
www.khronos.org/registry/OpenCL/sdk/docs/man/xhtml/clGetDeviceIDs.html
which currently also doesn't work...
(The strategy "remove the version number from the URL to get the latest version" also works for many pages...)

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tl;dr;

Could you please redirect
www.khronos.org/registry/OpenCL/sdk/2.2/docs/man/xhtml/ to www.khronos.org/registry/OpenCL/sdk/2.2/docs/man/html/ and
www.khronos.org/registry/OpenCL/sdk/docs/ to www.khronos.org/registry/OpenCL/sdk/latest/docs/ ?

^{Note: I previously had some URLs in this post wrong, but I've already corrected them.}

Start by checking the current behavior of the listed OpenCL SDK URLs and the existing `latest` redirect. Trace where these web redirects are configured or deployed, then ensure `2.2/docs/man/xhtml/` redirects to `2.2/docs/man/html/` and `docs/` redirects to `latest/docs/`; verify both example URL patterns work.

Written by the indexing model from the issue text.