Update upgrade documentation

docs/en/user/upgrade-2.0.x-2.1.1.rst

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+Upgrade from 2.0.x to 2.1.1
+===========================
+
+.. warning::
+Before this migration, if you configured the Pocket import by adding your consumer key in Internal settings, please do a backup of it: you'll have to add it into the Config page after the upgrade.
+
+Upgrade on a dedicated web server
+---------------------------------
+
+::
+
+    rm -rf var/cache/*
+    git fetch origin
+    git fetch --tags
+    git checkout 2.1.1 --force
+    SYMFONY_ENV=prod composer install --no-dev -o --prefer-dist
+    php bin/console cache:clear --env=prod
+
+Upgrade on a shared hosting
+---------------------------
+
+Backup your ``app/config/parameters.yml`` file.
+
+Download the last release of wallabag:
+
+.. code-block:: bash
+
+    wget http://framabag.org/wallabag-release-2.1.1.tar.gz && tar xvf wallabag-release-2.0.8.tar.gz
+
+(md5 hash of the 2.1.1 package: ``9584a3b60a2b2a4de87f536548caac93``)
+
+Extract the archive in your wallabag folder and replace ``app/config/parameters.yml`` with yours.
+
+Please check that your ``app/config/parameters.yml`` contains all the required parameters. Here is a default ``parameters.yml`` file. If you don't know which parameter you need to set, please leave the default one.
+
+.. code-block:: yml
+
+
+
+
+If you use SQLite, you must also copy your ``data/`` folder inside the new installation.
+
+Empty ``var/cache`` folder.
+
+You must run some SQL queries to upgrade your database. We assume that the table prefix is ``wallabag_`` and the database server is a MySQL one:
+
+.. code-block:: sql
+
+    ALTER TABLE `wallabag_entry` ADD `uuid` LONGTEXT DEFAULT NULL;
+    INSERT INTO `wallabag_craue_config_setting` (`name`, `value`, `section`) VALUES ('share_public', '1', 'entry');
+    ALTER TABLE `wallabag_oauth2_clients` ADD name longtext COLLATE 'utf8_unicode_ci' DEFAULT NULL;
+    INSERT INTO `wallabag_craue_config_setting` (`name`, `value`, `section`) VALUES ('import_with_redis', '0', 'import');
+    INSERT INTO `wallabag_craue_config_setting` (`name`, `value`, `section`) VALUES ('import_with_rabbitmq', '0', 'import');
+    ALTER TABLE `wallabag_config` ADD `pocket_consumer_key` VARCHAR(255) DEFAULT NULL;
+    DELETE FROM `wallabag_craue_config_setting` WHERE `name` = 'pocket_consumer_key';