More example values of toolchains in settings (#76)

Author: dannyfritz

lib/index.js

@@ -241,7 +241,7 @@ class RustLanguageClient extends AutoLanguageClient {
     this.config = {
       rlsToolchain: {
         description: 'Sets the toolchain installed using rustup and used to run the Rls.' +
-          ' For example ***beta*** or ***nightly-yyyy-mm-dd***.',
+          ' For example ***nightly***, ***stable***, ***beta***, or ***nightly-yyyy-mm-dd***.',
         type: 'string',
         default: 'nightly',
         order: 1