Address Google SEO Issues reaching reference pages

Searching for an OpenCL API entry point on Google does not necessarily reach the OpenCL 3.0 reference pages (i.e. the most recent ones, and the ones written to be universal to all past versions too).

Random sample of first results on Google:

- clSetEventCallback: Get Khronos OpenCL 1.2 reference page
- clCompileProgram: Get Khronos OpenCL 3.0 reference page
- clLinkProgram: Get man.opencl.org, which looks like it is OpenCL 2.1 derived

Other search engines do seem to return the 3.0 reference pages.

On issue #963 @outofcontrol said

> Google is refusing to give much credence to v3.0. Bing and DDG are happy with it. Google is getting more strict on load times, accessibility and mobile accessibility.