website/docs: document synced folder options [GH-2274]

website/docs/source/v2/synced-folders/basic_usage.html.md

@@ -25,6 +25,37 @@ parameter must be an absolute path of where to share the folder within
 the guest machine. This folder will be created (recursively, if it must)
 if it doesn't exist.
 
+## Options
+
+As an optional third parameter to configuring synced folders, you may specify
+some options. These options are listed below. More detailed examples of using
+some of these options are shown below this section.
+
+In addition to these options, the specific synced folder type might
+allow more options. See the documentation for your specific synced folder
+type for more details. The built-in synced folder types are documented
+in other pages available in the navigation for these docs.
+
+* `disabled` (boolean) - If true, this synced folder will be disabled and
+  won't be setup. This can be used to disable a previously defined synced
+  folder or to conditionally disable a definition based on some external
+  factor.
+
+* `group` (string) - The group that will own the synced folder. By default
+  this will be the SSH user. Some synced folder types don't support
+  modifying the group.
+
+* `mount_options` (array) - A list of additional mount options to pass
+ to the `mount` command.
+
+* `owner` (string) - The user who should be the owner of this synced folder.
+  By default this will be the SSH user. Some synced folder types don't
+  support modifying the owner.
+
+* `type` (string) - The type of synced folder. If this is not specified,
+  Vagrant will automatically choose the best synced folder option for your
+  environment. Otherwise, you can specify a specific type such as "nfs".
+
 ## Enabling
 
 Synced folders are automatically setup during `vagrant up` and