Adjust a few content oddities

Esp. fixing cases of https://github.com/tianon/markdownfmt/commit/91c4530fd21d57cdcdfb719f80f31115c3c2183d

backdrop/content.md

@@ -63,7 +63,6 @@ db:
     MYSQL_PASSWORD: %%REPO%%
     MYSQL_ALLOW_EMPTY_PASSWORD: 'yes'
     MYSQL_DATABASE: %%REPO%%
-
 ```
 
 Run `docker-compose up`, wait for it to initialize completely, and visit `http://localhost:8080` or `http://host-ip:8080`.

couchbase/content.md

@@ -51,8 +51,10 @@ N1QL is the SQL based query language for Couchbase Server. Simply switch to the
 
 You can also execute N1QL queries from the command line. To run a query from command line query tool, run the cbq command line tool, authenticating using the credentials you provided to the wizard, and execute the N1QL Query on the beer-sample bucket
 
-	$ docker exec -it db cbq --user Administrator
-	cbq> SELECT name FROM `beer-sample` WHERE brewery_id ="mishawaka_brewing";
+```console
+$ docker exec -it db cbq --user Administrator
+cbq> SELECT name FROM `beer-sample` WHERE brewery_id ="mishawaka_brewing";
+```
 
 For more query samples, refer to [Run your first N1QL query](https://docs.couchbase.com/server/current/getting-started/try-a-query.html).
 

emqx/content.md

@@ -281,7 +281,6 @@ Under linux host machine, the easiest way is [Tuning guide](https://docs.emqx.io
 If you want tune linux kernel by docker, you must ensure your docker is latest version (>=1.12).
 
 ```bash
-
 docker run -d --name emqx -p 18083:18083 -p 1883:1883 -p 4369:4369 \
     --sysctl fs.file-max=2097152 \
     --sysctl fs.nr_open=2097152 \
@@ -299,7 +298,6 @@ docker run -d --name emqx -p 18083:18083 -p 1883:1883 -p 4369:4369 \
     --sysctl net.ipv4.tcp_max_tw_buckets=1048576 \
     --sysctl net.ipv4.tcp_fin_timeout=15 \
     %%IMAGE%%:latest
-
 ```
 
 > REMEMBER: DO NOT RUN EMQ X DOCKER PRIVILEGED OR MOUNT SYSTEM PROC IN CONTAINER TO TUNE LINUX KERNEL, IT IS UNSAFE.

lightstreamer/content.md

@@ -92,7 +92,6 @@ In this case, the `/path/to/my-adapters` folder has to be structured with the re
                     +my_adapter_set_2
                     ...
                     +my_adapter_set_N
-
 ```
 
 ### Building a new image

postgres/content.md

@@ -34,7 +34,6 @@ postgres=# SELECT 1;
 ----------
         1
 (1 row)
-
 ```
 
 ## %%STACK%%