fix: add (expr) to dynamic block end (#30)

corpus/basic.tst

@@ -432,6 +432,19 @@ c
       contents: (contents
         (expr)))))
 
+================================================================================
+DynamicBlock.3  - End name
+================================================================================
+#+BEGIN: a
+#+END: a
+--------------------------------------------------------------------------------
+
+(document
+  body: (body
+    (dynamic_block
+      name: (expr)
+      end_name: (expr))))
+
 ================================================================================
 Comment.1 - Basic
 ================================================================================

grammar.js

@@ -234,6 +234,7 @@ org_grammar = {
       $._nl,
       optional(field('contents', $.contents)),
       caseInsensitive('#+end:'),
+      optional(field('end_name', $.expr)),
       $._eol,
     ),
 

src/grammar.json

@@ -1331,6 +1331,22 @@
           "named": false,
           "value": "#+end:"
         },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "FIELD",
+              "name": "end_name",
+              "content": {
+                "type": "SYMBOL",
+                "name": "expr"
+              }
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "SYMBOL",
           "name": "_eol"

src/node-types.json

@@ -292,6 +292,16 @@
           }
         ]
       },
+      "end_name": {
+        "multiple": false,
+        "required": false,
+        "types": [
+          {
+            "type": "expr",
+            "named": true
+          }
+        ]
+      },
       "name": {
         "multiple": false,
         "required": true,