[docs] add upgrade notes to platfrom docs for 0.10

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+@title = 'Upgrade to 0.10'
+@toc = false
+
+Upgrading to Platform 0.10
+---------------------------------------------
+
+If you have a node with the service 'tor' defined, you will need to change it to
+be either 'tor-relay', or 'tor-exit'. Look in your provider directory under the
+nodes directory for any .json file that has a 'services' section with 'tor'
+defined, change that to the correct tor service you are wanting to deploy.
+
+Make sure you have the correct version of leap_cli
+
+    workstation$ sudo gem install leap_cli --version=1.9
+
+If you are upgrading from a version previous to 0.9, please follow those upgrade
+instructions before upgrading to 0.10.
+
+Prepare your platform source by checking out the 0.10.x branch:
+
+    workstation$ cd leap_platform
+    workstation$ git fetch
+    workstation$ git checkout 0.10.x
+
+Then, deploy:
+
+    workstation$ cd $PROVIDER_DIR
+    workstation$ leap deploy
+    workstation$ leap test
+After deployment, if the leap test does not succeed, you should
+investigate. Please see below for some post-deployment upgrade steps that you
+may need to perform.
+
+Starting with Soledad Server 0.9.0, the CouchDB database schema was changed to
+improve speed of the server side storage backend. If you provided email, you
+will need to run the migration script, otherwise it is unnecessary. Until you
+migrate, soledad will refuse to start.
+
+To run the migration script, do the following (replacing $PROVIDER_DIR,
+$COUCHDB_NODE, $MX_NODE, and $SOLEDAD_NODE with your values):
+
+First backup your couchdb databases, just to be safe. NOTE: This can take some
+time and will place several hundred megabytes of data into
+/var/backups/couchdb. The size and time depends on how many users there are on
+your system. For example, 15k users took approximately 25 minutes and 308M of
+space:
+    workstation$ leap ssh $COUCHDB_NODE
+    server# cd /srv/leap/couchdb/scripts
+    server# ./cleanup-user-dbs
+    server# time ./couchdb_dumpall.sh
+
+ Once that has finished, then its time to run the migration:
+
+    workstation$ cd $PROVIDER_DIR
+    workstation$ leap run 'systemctl leap_mx stop' $MX_NODE
+    workstation$ leap run --stream '/usr/share/soledad-server/migration/0.9/migrate.py --log-file /var/log/leap/soledad_migration --verbose --do-migrate' $SOLEDAD_NODE
+    wait for it to finish (will print DONE)
+    rerun if interrupted
+    workstation$ leap deploy
+    workstation$ leap test
+
+Known Issues:
+
+If you have been deploying from our master branch (ie: unstable code), you might
+end up with a broken sources line for apt. If you get the following:
+    WARNING: The following packages cannot be authenticated!
+Then you should remove the files on your nodes inside
+/var/lib/puppet/modules/apt/keys and deploy again. (#8862, #8876)
+
+* When upgrading, sometimes systemd does not report the correct state of a
+  daemon. The daemon will be not running, but systemd thinks it is. The symptom
+  of this is that a deploy will succeed but `leap test` will fail. To fix, you
+  can run `systemctl stop DAEMON` and then `systemctl start DAEMON` on the
+  affected host (systemctl restart seems to work less reliably).
+
+Includes:
+
+* leap_web: 0.9.2
+* nickserver: 0.10.0
+* leap-mx: 0.10.1
+* soledad-server: 0.10.5
+
+Commits: https://0xacab.org/groups/leap/milestones/platform-010?title=Platform+0.10
+
+For details on about all the changes included in this release please consult the
+[LEAP platform 0.10 milestone](https://0xacab.org/leap/platform/milestones/7 ).
+
+
+
+Always a good idea to check if you have the latest version of leap_cli:
+
+    workstation$ sudo gem install leap_cli --version=1.9
+
+If you don't want to install using 'sudo':
+
+    workstation$ gem install --user-install leap_cli --version=1.9
+    workstation$ PATH="$PATH:$(ruby -e 'puts Gem.user_dir')/bin"
+