Rollup merge of #48626 - teiesti:fix-readme, r=frewsxcv
Rollup merge of #48626 - teiesti:fix-readme, r=frewsxcv

Fix link to rustc guide in README.md

This is a follow-up to #48479 and fixes a minor bug with the link to the rustc guide in the README.

r? @nikomatsakis

cc @mark-i-m

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