docs: naming conventions, guidelines

close #21063

runtime/lua/vim/ui.lua

@@ -1,6 +1,7 @@
 local M = {}
 
---- Prompts the user to pick a single item from a collection of entries
+--- Prompts the user to pick from a list of items, allowing arbitrary (potentially asynchronous)
+--- work until `on_choice`.
 ---
 ---@param items table Arbitrary items
 ---@param opts table Additional options
@@ -35,7 +36,6 @@ local M = {}
 ---     end
 --- end)
 --- </pre>
-
 function M.select(items, opts, on_choice)
   vim.validate({
     items = { items, 'table', false },
@@ -55,7 +55,8 @@ function M.select(items, opts, on_choice)
   end
 end
 
---- Prompts the user for input
+--- Prompts the user for input, allowing arbitrary (potentially asynchronous) work until
+--- `on_confirm`.
 ---
 ---@param opts table Additional options. See |input()|
 ---     - prompt (string|nil)