feat(nvim): add buffer to completion source

Author: moktavizen

nvim/.config/nvim/lua/plugins/lang.lua

@@ -424,7 +424,7 @@ return {
       },
 
       sources = {
-        default = { 'lsp', 'path', 'snippets', 'lazydev' },
+        default = { 'lsp', 'path', 'snippets', 'buffer', 'lazydev' },
         providers = {
           lazydev = { module = 'lazydev.integrations.blink', score_offset = 100 },
         },