Replace vim.opt with vim.o (nvim-lua#1495)

* Replace vim.opt with vim.o

Because it offers a nicer interface and info on hover.
For now leave vim.opt when using the table interface (until vim.o
with tables is implemented)

* Add type hint for vim.opt.rtp

* Add a comment about using vim.opt instead of vim.o

Author: oriori1703

init.lua

@@ -46,6 +46,13 @@ vim.keymap.set('x', 'p', '"_dP')
 
 -- views can only be fully collapsed with the global statusline
 vim.o.laststatus = 3
+-- Sync clipboard between OS and Neovim.
+--  Schedule the setting after `UiEnter` because it can increase startup-time.
+--  Remove this option if you want your OS clipboard to remain independent.
+--  See `:help 'clipboard'`
+vim.schedule(function()
+  vim.o.clipboard = 'unnamedplus'
+end)
 
 -- Enable break indent
 vim.o.breakindent = true
@@ -75,6 +82,14 @@ vim.o.splitbelow = true
 --  It is very similar to `vim.o` but offers an interface for conveniently interacting with tables.
 --   See `:help lua-options`
 --   and `:help lua-options-guide`vim.o.list = true
+-- Sets how neovim will display certain whitespace characters in the editor.
+--  See `:help 'list'`
+--  and `:help 'listchars'`
+--
+--  Notice listchars is set using `vim.opt` instead of `vim.o`.
+--  It is very similar to `vim.o` but offers an interface for conveniently interacting with tables.
+--   See `:help lua-options`
+--   and `:help lua-options-guide`
 vim.o.list = true
 vim.opt.listchars = { tab = '» ', trail = '·', nbsp = '␣' }