fix: snippet source markdown generation

Author: Saghen

lua/blink/cmp/sources/snippets/init.lua

@@ -48,7 +48,7 @@ function snippets:resolve(item, callback)
   local snippet = parsed_snippet and tostring(parsed_snippet) or item.insertText
 
   -- TODO: ideally context is passed with the filetype
-  local documentation = '```' .. vim.bo.filetype .. '\n' .. snippet .. '```' .. '\n---\n' .. item.description
+  local documentation = '```' .. vim.bo.filetype .. '\n' .. snippet .. '\n```' .. '\n---\n' .. item.description
 
   local resolved_item = vim.deepcopy(item)
   resolved_item.documentation = {