[rs] Merge gfx-rs#855

855: Remove comment about `Vec::remove_item` r=kvark a=Pat-Lafon

Sadly, `Vec::remove_item` was an unstable method that was deprecated and has now been removed.

rust-lang/rust#80972

This pr removes a comment suggesting to use `Vec::remove_item` when it stabilizes.

Co-authored-by: Patrick LaFontaine <[email protected]>

Author: bors[bot]

wgpu/src/lib.rs

@@ -556,7 +556,6 @@ impl MapContext {
             None => self.initial_range.end,
         };
 
-        // Switch this out with `Vec::remove_item` once that stabilizes.
         let index = self
             .sub_ranges
             .iter()