update vim-vital-vs to the latest (#1219)

Author: rhysd

autoload/vital/_lsp/VS/LSP/MarkupContent.vim

@@ -37,8 +37,6 @@ function! s:normalize(markup_content, ...) abort
     let l:normalized = a:markup_content.value
     if has_key(a:markup_content, 'language')
       let l:normalized = '```' . a:markup_content.language . ' ' . l:normalized . ' ```'
-    elseif get(a:markup_content, 'kind', 'plaintext') ==# 'plaintext'
-      let l:string = '```plaintext ' . l:string . ' ```'
     endif
   endif
   if l:option.compact

autoload/vital/_lsp/VS/Vim/Buffer.vim

@@ -49,7 +49,7 @@ endfunction
 function! s:ensure(expr) abort
   if !bufexists(a:expr)
     if type(a:expr) == type(0)
-      throw printf('VS.Vim.Buffer: `%s` is not valid expr.', l:bufnr)
+      throw printf('VS.Vim.Buffer: `%s` is not valid expr.', a:expr)
     endif
     badd `=a:expr`
   endif

autoload/vital/lsp.vital

@@ -1,5 +1,5 @@
 lsp
-5828301d6bae0858e9ea21012913544f5ef8e375
+2755f0c8fbd3442bcb7f567832e4d1455b57f9a2
 
 VS.LSP.MarkupContent
 VS.Vim.Window.FloatingWindow