try switch to lsp-zero for nvim

coc-nvim-config.vim

@@ -17,16 +17,16 @@ nmap <silent> gy <Plug>(coc-type-definition)
 nmap <silent> gi <Plug>(coc-implementation)
 nmap <silent> gr <Plug>(coc-references)
 
-" " Use K to show documentation in preview window.
-" nnoremap <silent> K :call <SID>show_documentation()<CR>
+" Use K to show documentation in preview window.
+nnoremap <silent> K :call <SID>show_documentation()<CR>
 
-" function! s:show_documentation()
-"   if CocAction('hasProvider', 'hover')
-"     call CocActionAsync('doHover')
-"   else
-"     call feedkeys('K', 'in')
-"   endif
-" endfunction
+function! s:show_documentation()
+  if CocAction('hasProvider', 'hover')
+    call CocActionAsync('doHover')
+  else
+    call feedkeys('K', 'in')
+  endif
+endfunction
 
 
 " Symbol renaming.