Updated Docker (markdown)

Docker.md

@@ -11,11 +11,13 @@ Make sure you have Docker installed and set up on your machine before following
 - [Overview](#)
 - [Docker Compose](#docker-compose) (recommended way)
   - [Setup](#setup)
+  - [Upgrading](https://github.com/ArchiveBox/ArchiveBox/wiki/Upgrading-or-Merging-Archives#upgrading-with-docker-compose-%EF%B8%8F)
   - [Usage](#usage)
   - [Accessing the data](#accessing-the-data)
   - [Configuration](#configuration)
 - [Plain Docker](#docker)
   - [Setup](#setup-1)
+  - [Upgrading](https://github.com/ArchiveBox/ArchiveBox/wiki/Upgrading-or-Merging-Archives#upgrading-with-plain-docker)
   - [Usage](#usage-1)
   - [Accessing the data](#accessing-the-data-1)
   - [Configuration](#configuration-1)
@@ -64,6 +66,10 @@ curl https://raw.githubusercontent.com/ArchiveBox/ArchiveBox/master/etc/sonic.cf
 docker-compose run archivebox update --index-only
 ```
 
+### Upgrading
+
+See https://github.com/ArchiveBox/ArchiveBox/wiki/Upgrading-or-Merging-Archives#upgrading-with-docker-compose-%EF%B8%8F
+
 ### Usage
 
 First, make sure you're `cd`'ed into the same folder as your `docker-compose.yml` file (e.g. the project root) and that your containers have been started with `docker-compose up -d`.
@@ -143,6 +149,10 @@ Replace `~/ArchiveBox` in the command above with the full path to a folder to us
 
 Make sure the data folder you use host is either a new, uncreated path, or if it already exists make sure it has permissions initially set to `777` so that the ArchiveBox command is able to set it to the specified `OUTPUT_PERMISSIONS` config setting on the first run.
 
+### Upgrading
+
+See https://github.com/ArchiveBox/ArchiveBox/wiki/Upgrading-or-Merging-Archives#upgrading-with-plain-docker
+
 ### Usage
 
 **To add a single URL to the archive** or a list of links from a file, pipe them in via stdin. This will archive each link passed in.