Rollup merge of #70706 - gizmondo:check-theme, r=GuillaumeGomez
Rollup merge of #70706 - gizmondo:check-theme, r=GuillaumeGomez

Minor cleanup in rustdoc --check-theme

Expand and remove try_something macro. Since https://github.com/rust-lang/rust/commit/2f6226518bd5085896a0f27cfd3ea396367ecd50 there has been only one invocation.

r? @GuillaumeGomez

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