Auto merge of #56134 - oli-obk:clippy_documentation, r=nrc
Auto merge of #56134 - oli-obk:clippy_documentation, r=nrc

Forward rust version number to tools

Clippy uses it to identify the correct documentation to point to

cc @Manishearth @nrc

sibling PR in clippy: https://github.com/rust-lang-nursery/rust-clippy/pull/3442

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