Clean up server setup instructions for MQTT and HTTP demos (#429)

- Removes a broken link to configure Windows Firewall
- Removes references to Mosquitto in the httpbin server setup instructions

FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Basic_TLS/mqtt_broker_setup.txt

@@ -34,11 +34,9 @@ TLS server-only authentication for use with this MQTT demo.
     d. If there is no output on step c, go through the Mosquitto documentation
        listed above to check if the setup was correct.
 8. Make sure the Mosquitto broker is allowed to communicate through
-   Windows Firewall. The instructions for allowing an application on Windows 10
-   Defender Firewall can be found at the link below.
-   https://support.microsoft.com/en-us/help/4558235/windows-10-allow-an-app-through-microsoft-defender-firewall
+   Windows Firewall.
    After running this MQTT example, consider disabling the Mosquitto broker to
-   communicate through Windows Firewall for avoiding unwanted network traffic
+   communicate through Windows Firewall to avoid unwanted network traffic
    to your machine.
 9. After verifying that a Mosquitto broker is running successfully, update
    the config `democonfigMQTT_BROKER_ENDPOINT` to the local IP address of your

FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/mqtt_broker_setup.txt

@@ -17,11 +17,9 @@ over plaintext for use with this MQTT demo.
     d. If there is no output on step c, go through the Mosquitto documentation
        listed above to check if the setup was correct.
 5. Make sure the Mosquitto broker is allowed to communicate through
-   Windows Firewall. The instructions for allowing an application on Windows 10
-   Defender Firewall can be found at the link below.
-   https://support.microsoft.com/en-us/help/4558235/windows-10-allow-an-app-through-microsoft-defender-firewall
+   Windows Firewall.
    After running this MQTT example, consider disabling the Mosquitto broker to
-   communicate through Windows Firewall for avoiding unwanted network traffic
+   communicate through Windows Firewall to avoid unwanted network traffic
    to your machine.
 6. After verifying that a Mosquitto broker is running successfully, update
    the config `democonfigMQTT_BROKER_ENDPOINT` to the local IP address of your

FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Multitask/mqtt_broker_setup.txt

@@ -41,7 +41,7 @@ TLS mutual authentication for use with this MQTT demo.
    Defender Firewall can be found at the link below.
    https://support.microsoft.com/en-us/help/4558235/windows-10-allow-an-app-through-microsoft-defender-firewall
    After running this MQTT example, consider disabling the Mosquitto broker to
-   communicate through Windows Firewall for avoiding unwanted network traffic
+   communicate through Windows Firewall to avoid unwanted network traffic
    to your machine.
 9. After verifying that a Mosquitto broker is running successfully, update
    the config `democonfigMQTT_BROKER_ENDPOINT` to the local IP address of your

FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Mutual_Auth/mqtt_broker_setup.txt

@@ -37,11 +37,9 @@ TLS mutual authentication for use with this MQTT demo.
     d. If there is no output on step c, go through the Mosquitto documentation
        listed above to check if the setup was correct.
 8. Make sure the Mosquitto broker is allowed to communicate through
-   Windows Firewall. The instructions for allowing an application on Windows 10
-   Defender Firewall can be found at the link below.
-   https://support.microsoft.com/en-us/help/4558235/windows-10-allow-an-app-through-microsoft-defender-firewall
+   Windows Firewall.
    After running this MQTT example, consider disabling the Mosquitto broker to
-   communicate through Windows Firewall for avoiding unwanted network traffic
+   communicate through Windows Firewall to avoid unwanted network traffic
    to your machine.
 9. After verifying that a Mosquitto broker is running successfully, update
    the config `democonfigMQTT_BROKER_ENDPOINT` to the local IP address of your

FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Plain_Text/mqtt_broker_setup.txt

@@ -17,11 +17,9 @@ over plaintext for use with this MQTT demo.
     d. If there is no output on step c, go through the Mosquitto documentation
        listed above to check if the setup was correct.
 5. Make sure the Mosquitto broker is allowed to communicate through
-   Windows Firewall. The instructions for allowing an application on Windows 10
-   Defender Firewall can be found at the link below.
-   https://support.microsoft.com/en-us/help/4558235/windows-10-allow-an-app-through-microsoft-defender-firewall
+   Windows Firewall.
    After running this MQTT example, consider disabling the Mosquitto broker to
-   communicate through Windows Firewall for avoiding unwanted network traffic
+   communicate through Windows Firewall to avoid unwanted network traffic
    to your machine.
 6. After verifying that a Mosquitto broker is running successfully, update
    the config `democonfigMQTT_BROKER_ENDPOINT` to the local IP address of your

FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Serializer/mqtt_broker_setup.txt

@@ -17,11 +17,9 @@ over plaintext for use with this MQTT demo.
     d. If there is no output on step c, go through the Mosquitto documentation
        listed above to check if the setup was correct.
 5. Make sure the Mosquitto broker is allowed to communicate through
-   Windows Firewall. The instructions for allowing an application on Windows 10
-   Defender Firewall can be found at the link below.
-   https://support.microsoft.com/en-us/help/4558235/windows-10-allow-an-app-through-microsoft-defender-firewall
+   Windows Firewall.
    After running this MQTT example, consider disabling the Mosquitto broker to
-   communicate through Windows Firewall for avoiding unwanted network traffic
+   communicate through Windows Firewall to avoid unwanted network traffic
    to your machine.
 6. After verifying that a Mosquitto broker is running successfully, update
    the config `democonfigMQTT_BROKER_ENDPOINT` to the local IP address of your