Tune completion sources & update comment

lua/plugins/completions.lua

@@ -81,11 +81,11 @@ return {
         ['<C-l>'] = cmp.mapping.confirm({ select = true }),
       }),
       sources = {
-        { name = 'nvim_lsp' },
         { name = 'luasnip' },
-        { name = 'buffer' },
+        { name = 'nvim_lsp' },
+        -- { name = 'buffer' },
         { name = 'path' },
-        { name = 'cmdline' },
+        -- { name = 'cmdline' },
       },
     })
 
@@ -98,7 +98,7 @@ return {
     vim.keymap.set('n', '<C-p>', vim.diagnostic.goto_prev, { noremap = true })
     vim.keymap.set('n', '<leader>sd', vim.diagnostic.open_float, { noremap = true })
 
-    -- Mappings to create once a language server attaches to a buffer
+    -- LSP mappings created when attached to a buffer
     local augroup = vim.api.nvim_create_augroup('lsp', { clear = true })
     vim.api.nvim_create_autocmd('LspAttach', {
       pattern = '*',