Centralise documentation of required minium values for device queries

Required minimum values for a number of queries are scattered throughout the specification which makes testing for these hard (see https://github.com/KhronosGroup/OpenCL-CTS/issues/928). Should we centralise the documentation of these like Vulkan does? This would make it easier to give an overview of the differences across profiles as well. The documentation for individual properties could link the centralised table for the exact values.

Review the scattered required minimum values in the specification, the OpenCL-CTS issue 928, and Vulkan's centralized documentation approach. Identify how a central table could link from individual property documentation, cover profile differences, and make the values easier to test.

Written by the indexing model from the issue text.