fix: allow comments in attributes

Author: dustypomerleau

editors/code/rust.tmGrammar.json

@@ -139,6 +139,12 @@
                 }
             },
             "patterns": [
+                {
+                    "include": "#block-comments"
+                },
+                {
+                    "include": "#comments"
+                },
                 {
                     "include": "#keywords"
                 },