fix errors in user guide (#302)

docs/user-guide.md

@@ -118,8 +118,8 @@ Let's walk through building an Akri installation command:
 
 3. Upgrade the installation to deploy the Discovery Handler you wish to use. Discovery Handlers are deployed as DaemonSets like the Agent when `<discovery handler name>.discovery.enabled` is set. 
     ```sh
-    helm upgrade akri akri-helm-charts/akri \
-        --set <discovery handler name>.discovery.enabled
+    helm upgrade akri akri-helm-charts/akri-dev \
+        --set <discovery handler name>.discovery.enabled=true
     ```
     > Note: To install a full Agent with embedded udev, OPC UA, and ONVIF Discovery Handlers, set `agent.full=true` instead of enabling the Discovery Handlers. Note, this we restart the 
     > Agent Pods.
@@ -130,9 +130,9 @@ Let's walk through building an Akri installation command:
 
 4. Upgrade the installation to apply a Configuration, which requests discovery of certain devices by a Discovery Handler. A Configuration is applied by setting  `<discovery handler name>.configuration.enabled`. While some Configurations may not require any discovery details to be set, oftentimes setting details is preferable for narrowing the Discovery Handlers' search. These are set under `<discovery handler name>.configuration.discoveryDetails`. For example, udev rules are passed to the udev Discovery Handler to specify which devices in the Linux device file system it should search for by setting `udev.configuration.discoveryDetails.udevRules`. Akri can be instructed to automatically deploy workloads called "brokers" to each discovered device by setting a broker Pod image in a Configuration via `--set <protocol>.configuration.brokerPod.image.repository=<your broker image>`.
     ```sh
-    helm upgrade akri akri-helm-charts/akri \
-        --set <discovery handler name>.discovery.enabled \
-        --set <discovery handler name>.configuration.enabled \
+    helm upgrade akri akri-helm-charts/akri-dev \
+        --set <discovery handler name>.discovery.enabled=true \
+        --set <discovery handler name>.configuration.enabled=true \
         # set any discovery details in the Configuration
         # specify any broker images in the Configuration
     ```
@@ -141,16 +141,16 @@ Installation could have been done in one step rather than a series of upgrades:
 ```sh
 helm repo add akri-helm-charts https://deislabs.github.io/akri/
 helm install akri akri-helm-charts/akri-dev \
-    --set <discovery handler name>.discovery.enabled \
-    --set <discovery handler name>.configuration.enabled \
+    --set <discovery handler name>.discovery.enabled=true \
+    --set <discovery handler name>.configuration.enabled=true \
     # set any discovery details in the Configuration
     # specify any broker images in the Configuration
 ```
 As a real example, Akri's Controller, Agents, udev Discovery Handlers, and a udev Configuration that specifies the discovery of only USB video devices and an nginx broker image are installed like so:
 ```sh
 helm install akri akri-helm-charts/akri-dev \
-    --set udev.discovery.enabled \
-    --set udev.configuration.enabled \
+    --set udev.discovery.enabled=true \
+    --set udev.configuration.enabled=true \
     --set udev.configuration.discoveryDetails.udevRules[0]='KERNEL=="video[0-9]*"' \
     --set udev.configuration.brokerPod.image.repository=nginx
 ```