Fix documentation under newer VSCode lang server

Author: AlexeyRaga

package-lock.json

@@ -6,7 +6,7 @@
     "license": "MIT",
     "publisher": "alanz",
     "engines": {
-        "vscode": "^1.18.0"
+        "vscode": "^1.22.0"
     },
     "keywords": [
         "language",
@@ -217,6 +217,6 @@
         "justusadam.language-haskell"
     ],
     "dependencies": {
-        "vscode-languageclient": "^3.5.0"
+        "vscode-languageclient": "^4.1.3"
     }
 }

package.json

@@ -72,6 +72,11 @@ export namespace DocsBrowser {
             const mstr = new MarkdownString(transform(ms));
             mstr.isTrusted = true;
             return mstr;
+        }
+        else if (typeof ms === 'object') {
+            const mstr = new MarkdownString(transform(ms.value));
+            mstr.isTrusted = true;
+            return mstr;
         } else {
             return ms;
         }