Add query error: invalid node type at position to the troubleshooting section

We have had many of these recently...

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -14,6 +14,8 @@ body:
           required: true
         - label: I have run `:TSUpdate`
           required: true
+        - label: I have read the [troubleshooting section](https://github.com/nvim-treesitter/nvim-treesitter#troubleshooting)
+          required: true
 
   - type: textarea
     attributes:
@@ -57,4 +59,3 @@ body:
     attributes:
       label: Additional context
       description: Add any context about the problem here.
-

README.md

@@ -470,6 +470,17 @@ Try updating the parser that you suspect has changed (`:TSUpdate {language}`) or
 If the error persists after updating all parsers,
 please [open an issue](https://github.com/nvim-treesitter/nvim-treesitter/issues/new/choose).
 
+#### I get `query error: invalid node type at position`
+
+This could be due a query file outside this plugin using outdated nodes,
+or due to an outdated parser.
+
+- Make sure you have the parsers up to date with `:TSUpdate`
+- Make sure you don't have more than one `parser` runtime directory.
+  You can execute this command `:echo nvim_get_runtime_file('parser', v:true)` to find all runtime directories.
+  If you get more than one path, remove the ones that are outside this plugin (`nvim-treesitter` directory),
+  so the correct version of the parser is used.
+
 #### I experience weird highlighting issues similar to [#78](https://github.com/nvim-treesitter/nvim-treesitter/issues/78)
 
 This is a well known issue, which arises when the tree and the buffer have gotten out of sync.