UPGRADING: Indent and set langauges on code blocks.

UPGRADING.md

@@ -49,14 +49,14 @@ section.
 3. Verify that your updated `docker-compose.yml` points to the desired image version,
    e.g.:
 
-```yml
+   ```yaml
    zulip:
      image: "zulip/docker-zulip:2.0.1-0"
    ```
 
 4. You can execute the upgrade by running:
 
-```
+   ```shell
    # Stops the old zulip container; this begins your downtime
    docker-compose stop
    # Boots the new zulip container; this ends your downtime
@@ -68,7 +68,7 @@ docker-compose rm
 That's it! Zulip is now running the updated version.
 You can confirm you're running the latest version by running:
 
-```bash
+```shell
 docker-compose exec -u zulip zulip cat /home/zulip/deployments/current/version.py
 ```
 
@@ -78,7 +78,7 @@ docker-compose exec -u zulip zulip cat /home/zulip/deployments/current/version.p
    specify the Git commit you'd like to build the zulip container from.
    E.g.:
 
-```
+   ```yaml
    zulip:
      # image: "zulip/docker-zulip:2.0.1-0"
      build:
@@ -89,10 +89,9 @@ docker-compose exec -u zulip zulip cat /home/zulip/deployments/current/version.p
          ZULIP_GIT_REF: master
    ```
 
-You can set `ZULIP_GIT_URL` to any clone of the zulip/zulip git
-repository, and `ZULIP_GIT_REF` to be any ref name in that repository
-(e.g. `master` or `1.9.0` or
-`445932cc8613c77ced023125248c8b966b3b7528`).
+   You can set `ZULIP_GIT_URL` to any clone of the zulip/zulip git repository,
+   and `ZULIP_GIT_REF` to be any ref name in that repository (e.g. `master` or
+   `1.9.0` or `445932cc8613c77ced023125248c8b966b3b7528`).
 
 2. Run `docker-compose build zulip` to build a Zulip Docker image from
    the specified Git version.
@@ -133,7 +132,7 @@ occurences of `/opt/docker/zulip/postgresql/data` with your path.
 
 3. Create a new (upgraded) Postgres container using a different data directory:
 
-```
+   ```shell
    docker run -d \
          --name postgresnew \
          -e POSTGRES_DB=zulip \
@@ -146,14 +145,14 @@ docker run -d \
 4. Use `pg_dumpall` to dump all data from the existing Postgres container to
    the new Postgres container:
 
-```
+   ```shell
    docker-compose exec database pg_dumpall -U postgres | \
        docker exec -i postgresnew psql -U postgres
    ```
 
 5. Stop and remove both Postgres containers:
 
-```
+   ```shell
    docker-compose rm --stop database
    docker rm --stop postgresnew
    ```
@@ -164,20 +163,20 @@ docker rm --stop postgresnew
 
 7. Replace the old Postgres data directory with upgraded data directory:
 
-```
+   ```shell
    mv /opt/docker/zulip/postgresql/data /opt/docker/zulip/postgresql/old
    mv /opt/docker/zulip/postgresql/new /opt/docker/zulip/postgresql/data
    ```
 
 8. Delete the old existing containers:
 
-```
+   ```shell
    docker-compose rm
    ```
 
 9. Start Zulip up again:
 
-```
+   ```shell
    docker-compose up
    ```