doc: remove fs_poll interval and update doc

doc/nvim-tree-lua.txt

@@ -278,7 +278,6 @@ Subsequent calls to setup will replace the previous configuration.
       },
       filesystem_watchers = {
         enable = false,
-        interval = 100,
         debounce_delay = 50,
       },
       git = {
@@ -523,7 +522,7 @@ Git integration with icons and colors.
   process returned the data.
 
 *nvim-tree.filesystem_watchers*
-Will use file system watcher (libuv fs_poll) to watch the filesystem for
+Will use file system watcher (libuv fs_event) to watch the filesystem for
 changes.
 Using this will disable BufEnter / BufWritePost events in nvim-tree which
 were used to update the whole tree. With this feature, the tree will be
@@ -535,12 +534,6 @@ This will be experimental for a few weeks and will become the default.
     Enable / disable the feature.
       Type: `boolean`, Default: `false`
 
-    *nvim-tree.filesystem_watchers.interval*
-    Milliseconds between polls for each directory.
-    Increase to at least 1000ms if changes are not visible. See
-    https://github.com/luvit/luv/blob/master/docs.md#uvfs_poll_startfs_poll-path-interval-callback
-      Type: `number`, Default: `100` (ms)
-
     *nvim-tree.filesystem_watchers.debounce_delay*
     Idle milliseconds between filesystem change and action.
       Type: `number`, Default: `50` (ms)

lua/nvim-tree.lua

@@ -535,7 +535,6 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
   },
   filesystem_watchers = {
     enable = false,
-    interval = 100,
     debounce_delay = 50,
   },
   git = {

lua/nvim-tree/explorer/watch.lua

@@ -48,7 +48,6 @@ function M.create_watcher(absolute_path)
   log.line("watcher", "node start '%s'", absolute_path)
   return Watcher.new {
     absolute_path = absolute_path,
-    interval = M.interval,
     on_event = function(opts)
       log.line("watcher", "node event scheduled '%s'", opts.absolute_path)
       utils.debounce("explorer:watch:" .. opts.absolute_path, M.debounce_delay, function()
@@ -60,7 +59,6 @@ end
 
 function M.setup(opts)
   M.enabled = opts.filesystem_watchers.enable
-  M.interval = opts.filesystem_watchers.interval
   M.debounce_delay = opts.filesystem_watchers.debounce_delay
 end
 

lua/nvim-tree/git/init.lua

@@ -131,7 +131,6 @@ function M.load_project_status(cwd)
     watcher = Watcher.new {
       absolute_path = utils.path_join { project_root, ".git" },
       project_root = project_root,
-      interval = M.config.filesystem_watchers.interval,
       on_event = function(opts)
         log.line("watcher", "git event scheduled '%s'", opts.project_root)
         utils.debounce("git:watcher:" .. opts.project_root, M.config.filesystem_watchers.debounce_delay, function()