Update how-to-configure-proxy-support.md

Following TOML v1.0 guidelines, replace quoted keys with bare keys.
https://toml.io/en/v1.0.0#keyvalue-pair

Quoted keys follow the exact same rules as either basic strings or literal strings, allowing for a much broader set of key names. However, best practice is to use bare keys unless absolutely necessary.

Author: minorutsuchida

articles/iot-edge/how-to-configure-proxy-support.md

@@ -213,9 +213,9 @@ This step takes place once on the IoT Edge device during initial device setup.
     image = "mcr.microsoft.com/azureiotedge-agent:1.5"
 
     [agent.env]
-    # "RuntimeLogLevel" = "debug"
-    # "UpstreamProtocol" = "AmqpWs"
-    "https_proxy" = "<proxy URL>"
+    # RuntimeLogLevel = "debug"
+    # UpstreamProtocol = "AmqpWs"
+    https_proxy = "<proxy URL>"
     ```
 
 4. The IoT Edge runtime uses AMQP by default to communicate with IoT Hub. Some proxy servers block AMQP ports. If that's the case, then you also need to configure edgeAgent to use AMQP over WebSocket. Remove the comment from the `UpstreamProtocol` parameter.
@@ -225,9 +225,9 @@ This step takes place once on the IoT Edge device during initial device setup.
     image = "mcr.microsoft.com/azureiotedge-agent:1.5"
 
     [agent.env]
-    # "RuntimeLogLevel" = "debug"
-    "UpstreamProtocol" = "AmqpWs"
-    "https_proxy" = "<proxy URL>"
+    # RuntimeLogLevel = "debug"
+    UpstreamProtocol = "AmqpWs"
+    https_proxy = "<proxy URL>"
     ```
 
 3. Add the **https_proxy** parameter to the environment variables section, and set your proxy URL as its value.
@@ -241,9 +241,9 @@ This step takes place once on the IoT Edge device during initial device setup.
     image = "mcr.microsoft.com/azureiotedge-agent:1.5"
 
     [agent.env]
-    # "RuntimeLogLevel" = "debug"
-    # "UpstreamProtocol" = "AmqpWs"
-    "https_proxy" = "<proxy URL>"
+    # RuntimeLogLevel = "debug"
+    # UpstreamProtocol = "AmqpWs"
+    https_proxy = "<proxy URL>"
     ```
 
 4. The IoT Edge runtime uses AMQP by default to talk to IoT Hub. Some proxy servers block AMQP ports. If that's the case, then you also need to configure edgeAgent to use AMQP over WebSocket. Uncomment the `UpstreamProtocol` parameter.
@@ -253,9 +253,9 @@ This step takes place once on the IoT Edge device during initial device setup.
     image = "mcr.microsoft.com/azureiotedge-agent:1.5"
 
     [agent.env]
-    # "RuntimeLogLevel" = "debug"
-    "UpstreamProtocol" = "AmqpWs"
-    "https_proxy" = "<proxy URL>"
+    # RuntimeLogLevel = "debug"
+    UpstreamProtocol = "AmqpWs"
+    https_proxy = "<proxy URL>"
     ```
 
 5. Save the changes and close the editor. Apply the changes.