docs: fix internal link to download command

Author: fspoettel

README.md

@@ -144,7 +144,7 @@ cargo clippy
 1. Install [`aoc-cli`](https://github.com/scarvalhojr/aoc-cli/) via cargo: `cargo install aoc-cli`.
 2. Create an `.adventofcode.session` file in your home directory and paste your session cookie[^1] into it. To get this, press F12 anywhere on the Advent of Code website to open your browser developer tools. Look in your Cookies under the Application or Storage tab, and copy out the `session` cookie value.
 
-Once installed, you can use the [download command](#download-inputs-for-a-day).
+Once installed, you can use the [download command](#download-input-for-a-day).
 
 ### Enable clippy lints in CI