docs: add a link to the toolchain version page

YdrMaster · YdrMaster · commit 16f9f09bef68 · 2022-10-20T11:46:16.000+08:00
Signed-off-by: YdrMaster &lt;ydrml@hotmail.com&gt;
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -1,4 +1,5 @@
 [toolchain]
 profile = "minimal"
+# use the nightly version of the last stable toolchain, see <https://forge.rust-lang.org/>
 channel = "nightly-2022-08-05"
 components = ["rust-src", "llvm-tools-preview", "rustfmt", "clippy"]
