Update faas-cli version

- updates faas-cli version and also mentions that ./faas-cli
is no longer needed because the binary is available in the PATH

Reported by: Danilo Henrique

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

docs/cli/templates.md

@@ -402,7 +402,7 @@ You can browse templates from our official store or create your own store and ad
 
 To see what templates are available type `faas-cli template store list` and you should see the following in the terminal:
 ```
-$ ./faas-cli template store list
+$ faas-cli template store list
 
 NAME                    SOURCE             DESCRIPTION
 csharp                  openfaas           Official C# template

docs/reference/cron.md

@@ -70,14 +70,16 @@ spec:
         spec:
           containers:
           - name: faas-cli
-            image: openfaas/faas-cli:0.7.1
+            image: openfaas/faas-cli:0.8.3
             args:
             - /bin/sh
             - -c
-            - echo "verbose" | ./faas-cli invoke nodeinfo -g http://gateway.openfaas:8080
+            - echo "verbose" | faas-cli invoke nodeinfo -g http://gateway.openfaas:8080
           restartPolicy: OnFailure
 ```
 
+You should also update the `image` to the latest version of the `faas-cli` available found via the [Docker Hub](https://hub.docker.com/r/openfaas/faas-cli/tags/) or [faas-cli releases](https://github.com/openfaas/faas-cli/releases) page.
+
 The important thing to notice is that we are using a Docker container with the `faas-cli` to invoke the function. This keeps the job very generic and easy to generize to other functions.
 
 We schedule the job by applying our manifest
@@ -157,7 +159,7 @@ In this example, I created the CronJob in the same namespace as the `gateway`. I
 
 If you have enabled basic auth on the gateway, then the invoke command will also need to be updated to first login the cli client. Assuming that you have created the basic auth secret as in the [Helm install guide](https://github.com/openfaas/faas-netes/tree/master/chart/openfaas#secure-the-gateway-administrative-api-and-ui-with-basic-auth)
 
-You could then update the CronJob to login, like this
+You could then update the CronJob to login, like this:
 
 ```yaml
 # nodeauth-cron.yaml
@@ -177,7 +179,7 @@ spec:
         spec:
           containers:
           - name: faas-cli
-            image: openfaas/faas-cli:0.7.1
+            image: openfaas/faas-cli:0.8.3
             env:
               - name: USERNAME
                 valueFrom:
@@ -192,8 +194,8 @@ spec:
             args:
             - /bin/sh
             - -c
-            - echo -n $PASSWORD | ./faas-cli login -g http://gateway.openfaas:8080 -u $USERNAME --password-stdin
-            - echo "verbose" | ./faas-cli invoke nodeinfo -g http://gateway.openfaas:8080
+            - echo -n $PASSWORD | faas-cli login -g http://gateway.openfaas:8080 -u $USERNAME --password-stdin
+            - echo "verbose" | faas-cli invoke nodeinfo -g http://gateway.openfaas:8080
           restartPolicy: OnFailure
 ```