Make comments a single node in the grammar

This looks to be a *strong* idiom in tree-sitter parsers.

src/grammar.json

@@ -21,33 +21,38 @@
         }
       ]
     },
-    "line_comment": {
-      "type": "SEQ",
+    "comment": {
+      "type": "CHOICE",
       "members": [
         {
-          "type": "STRING",
-          "value": "//"
+          "type": "SEQ",
+          "members": [
+            {
+              "type": "STRING",
+              "value": "//"
+            },
+            {
+              "type": "PATTERN",
+              "value": "[^\\n]*"
+            }
+          ]
         },
         {
-          "type": "PATTERN",
-          "value": "[^\\n]*"
-        }
-      ]
-    },
-    "block_comment": {
-      "type": "SEQ",
-      "members": [
-        {
-          "type": "STRING",
-          "value": "/*"
-        },
-        {
-          "type": "PATTERN",
-          "value": "[^*]*\\*+([^/*][^*]*\\*+)*"
-        },
-        {
-          "type": "STRING",
-          "value": "/"
+          "type": "SEQ",
+          "members": [
+            {
+              "type": "STRING",
+              "value": "/*"
+            },
+            {
+              "type": "PATTERN",
+              "value": "[^*]*\\*+([^/*][^*]*\\*+)*"
+            },
+            {
+              "type": "STRING",
+              "value": "/"
+            }
+          ]
         }
       ]
     },
@@ -956,11 +961,7 @@
     },
     {
       "type": "SYMBOL",
-      "name": "line_comment"
-    },
-    {
-      "type": "SYMBOL",
-      "name": "block_comment"
+      "name": "comment"
     }
   ],
   "conflicts": [],

src/node-types.json

@@ -168,12 +168,12 @@
     }
   },
   {
-    "type": "block_comment",
+    "type": "boolean_literal",
     "named": true,
     "fields": {}
   },
   {
-    "type": "boolean_literal",
+    "type": "comment",
     "named": true,
     "fields": {}
   },
@@ -259,11 +259,6 @@
       ]
     }
   },
-  {
-    "type": "line_comment",
-    "named": true,
-    "fields": {}
-  },
   {
     "type": "list_expression",
     "named": true,