Fix clippy_preference description formatting

Author: alexheretic

lib/index.js

@@ -268,7 +268,7 @@ class RustLanguageClient extends AutoLanguageClient {
           },
           clippyPreference: {
             title: "Clippy Preference",
-            description: 'Controls eagerness of clippy diagnostics. `Opt-in` requires each crate specifying `#![warn(clippy)]. Note clippy is only available on Rls releases that have it enabled at compile time.',
+            description: 'Controls eagerness of clippy diagnostics. **Opt-in** requires each crate specifying `#![warn(clippy)]`. Note clippy is only available on Rls releases that have it enabled at compile time.',
             type: "string",
             default: "Rls Default",
             order: 2,