Remove implementations section since it should be in the PR description

proposals/4347-emoji-verification-images.md

@@ -194,12 +194,3 @@ None required.
 ## Dependencies
 
 None.
-
-## Implementations
-
-There is a draft Element Web implementation in
-[element-web#31571](https://github.com/element-hq/element-web/pull/31571), which
-uses a temporary custom version of the spec npm package at
-[andybalaam-matrix-spec](https://www.npmjs.com/package/andybalaam-matrix-spec),
-built from a draft spec PR at
-[matrix-spec#2273](https://github.com/matrix-org/matrix-spec/pull/2273).