[libcxx-commits] [libcxx] [libcxx][NFC] Rename iterator/sentinel type template parameter names (PR #76201)

[Will Hawkins via libcxx-commits]

hawkinsw wrote:

After reading through the discussion from the Discord (https://discord.com/channels/636084430946959380/956590603808931870), I thought I would try to be helpful. Obviously I understand that the discussion was really in the context of implementation code and *not* test code, but I thought I would try to contribute.

I will (of course) rebase when the code formatting change lands. 

https://github.com/llvm/llvm-project/pull/76201