Merge pull request #3403 from will/sorbetwatchman

Add Ruby sorbet option to enable watchman

doc/ale-ruby.txt

@@ -177,6 +177,16 @@ g:ale_ruby_sorbet_options                           *g:ale_ruby_sorbet_options*
   This variable can be changed to modify flags given to sorbet.
 
 
+g:ale_ruby_sorbet_enable_watchman           *g:ale_ruby_sorbet_enable_watchman*
+                                            *b:ale_ruby_sorbet_enable_watchman*
+  Type: |Number|
+  Default: `0`
+
+  Whether or not to use watchman to let the LSP server to know about changes
+  to files from outside of vim. Defaults to disable watchman because it
+  requires watchman to be installed separately from sorbet.
+
+
 ===============================================================================
 standardrb                                                *ale-ruby-standardrb*