Update docs.

docs/docker-ubuntu.md

@@ -8,21 +8,21 @@ Before you install Docker Engine for the first time on a new host machine, you n
 
 1.  Set up the repository:  Update the apt package index and install packages to allow apt to use a repository over HTTPS:
 
-	```bash
+	```
 	sudo apt-get update
 	sudo apt-get install ca-certificates curl gnupg lsb-release
 	```
 
 2.  Add Docker’s official GPG key:
 
-	```bash
+	```
 	sudo mkdir -p /etc/apt/keyrings
 	curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
 	```
 
 3.  Use the following command to set up the repository:
 
-	```bash
+	```
 	echo \
   	"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
   	$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
@@ -31,13 +31,13 @@ Before you install Docker Engine for the first time on a new host machine, you n
 4.  Install Docker Engine
 Update the apt package index:
 
-	```bash
+	```
 	sudo apt-get update
 	```
 
 5.  Install latest Docker Engine, containerd, and Docker Compose:
 
-	```bash
+	```
 	sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin
 	```
 

docs/iot-over-mqtt.md

@@ -308,6 +308,9 @@ docker run -it --rm --name mqtt-subscriber \
 
 The terminal will then be ready to receive events
 
+> **Note:** There is no change on whilst running this command. The on screen output
+> will only respond once you have completed the next step.
+
 ### Start an MQTT Publisher (2nd Terminal)
 
 A sensor sending northbound measurements will publish to those measurements to the MQTT Broker to be passed on to any