docs(vue): update vue support section (neovim#3060)

* docs(vue): update vue support section

as johnsoncodehk mentioned here:
vuejs/language-tools#3925 (comment)

* chore: fix typo

* chore: fix typo

lua/lspconfig/server_configurations/tsserver.lua

@@ -44,11 +44,13 @@ Here's an example that disables type checking in JavaScript files.
 }
 ```
 
-# Vue support
+### Vue support
 
-As of 2.0.0, Volar no longer supports TypeScript itself. Instead, a plugin adds
+As of 2.0.0, Volar no longer supports TypeScript itself. Instead, a plugin
 adds Vue support to this language server.
 
+*IMPORTANT*: It is crucial to ensure that `@vue/typescript-plugin` and `volar `are of identical versions.
+
 ```lua
 require'lspconfig'.tsserver.setup{
   init_options = {
@@ -66,6 +68,10 @@ require'lspconfig'.tsserver.setup{
     "vue",
   },
 }
+
+-- You must make sure volar is setup
+-- e.g. require'lspconfig'.volar.setup{}
+-- See volar's section for more information
 ```
 
 `location` MUST be defined. If the plugin is installed in `node_modules`,