[llvm] [RISCV][docs] GP Relaxation and Small Data Limit (PR #108592)

[Michael Maitland via llvm-commits]

https://github.com/michaelmaitland commented:

Thanks for this change. I would love for us to clear things up on PIE/PIC behavior in another PR at some point.

https://github.com/llvm/llvm-project/pull/108592