"Built-in functions for SYCL host and device" chapter desing

[PetroBondar]

Currently, the SYCL Built-in functions for SYCL host and device chapter is not represented in the Reference Guide.

We propose to add it with the following structure:

• Built-in functions
  • Function objects (4.17.1. Function objects)
  • Group functions (4.17.2. Group functions)
  • Group algorithms library (4.17.3. Group algorithms library)
  • Math functions (4.17.4. Math functions)
  • Native precision math functions (4.17.5. Native precision math functions)
  • Half precision math functions (4.17.6. Half precision math functions)
  • Integer functions (4.17.7. Integer functions)
  • Common functions (4.17.8. Common functions)
  • Geometric functions (4.17.9. Geometric functions)
  • Relational functions (4.17.10. Relational functions)

This chapter will appear last in the contents bar.

Could you please review and provide your opinion and recommendations for this chapter?
We will create PR after a discussion.

[mkinsner]

This proposal looks good to me!

[PetroBondar]

Thanks for the comment!
Created PR: #133