Rollup merge of #33509 - birkenfeld:issue-30219, r=alexcrichton
Rollup merge of #33509 - birkenfeld:issue-30219, r=alexcrichton

rustdoc: fix emitting duplicate implementors in .js files

The collect() fn checks for double quotes; use them here as well.

Fixes: #30219

aidancully/rust,graydon/rust,graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust