Merge pull request #744 from matrix-org/jplatte/readme

chore: Fix `main` docs link in readme

Author: gnunicorn

README.md

@@ -2,7 +2,7 @@
 [![codecov](https://img.shields.io/codecov/c/github/matrix-org/matrix-rust-sdk/main.svg?style=flat-square)](https://codecov.io/gh/matrix-org/matrix-rust-sdk)
 [![License](https://img.shields.io/badge/License-Apache%202.0-yellowgreen.svg?style=flat-square)](https://opensource.org/licenses/Apache-2.0)
 [![#matrix-rust-sdk](https://img.shields.io/badge/matrix-%23matrix--rust--sdk-blue?style=flat-square)](https://matrix.to/#/#matrix-rust-sdk:matrix.org)
-[![Docs - Main](https://img.shields.io/badge/docs-main-blue.svg?style=flat-square)](https://matrix-org.github.io/matrix-rust-sdk/)
+[![Docs - Main](https://img.shields.io/badge/docs-main-blue.svg?style=flat-square)](https://matrix-org.github.io/matrix-rust-sdk/matrix_sdk/)
 [![Docs - Stable](https://img.shields.io/crates/v/matrix-sdk?color=blue&label=docs&style=flat-square)](https://docs.rs/matrix-sdk)
 
 # matrix-rust-sdk