Updating comments for PWLE v2 APIs

Updating some of the comments for the PWLE v2 APIs to clarify what PWLE effects are.

Bug: 347034419
Flag: EXEMPT HAL interface change
Test: N/A
Change-Id: Iac13d27da3f4c2cd5a5ed37ca9e2303f9c4c9802
3 files changed