parser: fix usage of incorrect error tag

Closes #13921

lib/std/zig/parse.zig

@@ -286,7 +286,7 @@ const Parser = struct {
                 .keyword_comptime => switch (p.token_tags[p.tok_i + 1]) {
                     .l_brace => {
                         if (doc_comment) |some| {
-                            try p.warnMsg(.{ .tag = .test_doc_comment, .token = some });
+                            try p.warnMsg(.{ .tag = .comptime_doc_comment, .token = some });
                         }
                         const comptime_token = p.nextToken();
                         const block = p.parseBlock() catch |err| switch (err) {

lib/std/zig/parser_test.zig

@@ -4210,6 +4210,18 @@ test "zig fmt: remove newlines surrounding doc comment within container decl" {
     );
 }
 
+test "zig fmt: invalid else branch statement" {
+    try testError(
+        \\/// This is a doc comment for a comptime block.
+        \\comptime {}
+        \\/// This is a doc comment for a test
+        \\test "This is my test" {}
+    , &[_]Error{
+        .comptime_doc_comment,
+        .test_doc_comment,
+    });
+}
+
 test "zig fmt: invalid else branch statement" {
     try testError(
         \\comptime {