Fix some lint in completsions.lua

lua/plugins/completions.lua

@@ -173,7 +173,7 @@ return {
       },
 
       formatting = {
-        format = function(entry, vim_item)
+        format = function(_, vim_item)
           -- Set a limit to how wide the completion menu can be
           local winwidth = vim.fn.winwidth(vim.api.nvim_get_current_win())
           local menuwidth = math.min(winwidth / 2, 70)
@@ -191,7 +191,7 @@ return {
         documentation = cmp.config.window.bordered(),
       },
 
-      preselect = 'none', -- Don't preselect completions suggested by source
+      preselect = 'None', -- Don't preselect completions suggested by source
     })
     require("cmp_git").setup({})