add syntax highlighting for vimscript code

Author: Techatrix

content/zls/install.smd

@@ -206,7 +206,7 @@ lspconfig.zls.setup {
 
 []($section.id('nvim-lspconfig-init-vimscript'))
 
-```
+```vim
 call plug#begin('~/.config/nvim/plugged')
   Plug 'neovim/nvim-lspconfig' " https://github.com/neovim/nvim-lspconfig
   Plug 'ziglang/zig.vim'       " https://github.com/ziglang/zig.vim
@@ -272,7 +272,7 @@ Add ZLS in your `coc-settings.json` (open it using `:CocConfig`) like this:
 - Install YouCompleteMe from [here](https://github.com/ycm-core/YouCompleteMe.git).
 - Add these lines to your vimrc:
 
-```
+```vim
 "ensure zig is a recognized filetype
 autocmd BufNewFile,BufRead *.zig set filetype=zig
 let g:ycm_language_server =