Auto merge of #7185 - kpreid:patch-1, r=giraffate
Auto merge of #7185 - kpreid:patch-1, r=giraffate

Fix duplicated "Rust 1.52" version section header

The most recent changelog update 037ddf282bbf011babd4b7f9a851f6028fc6fd70 accompanying the 1.52 release added a second "Rust 1.52" section header, with the result that the Rust release announcement https://blog.rust-lang.org/2021/05/06/Rust-1.52.0.html is linking to the "current beta" changelog section for Clippy rather than the stable changelog. I don't know the release process but based on previous changes to this file, I assume the correct thing to do is to mark the topmost section as being for Rust 1.53, not 1.52.

changelog: none

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