docs: use workload terminology for spec API

The specification hasn't used the noun "application" to refer to
workloads for a little while, but our documentation still had a few
references to that terminology.  This changes them to use "workload"
instead.

Signed-off-by: Andy Sadler <[email protected]>

Author: sadlerap

docs/userguide/modules/binding-workloads-using-sbo/pages/creating-service-binding.adoc

@@ -29,10 +29,10 @@ spec:
     kind: Deployment
     name: online-banking
   services: <2>
-  - version: v1alpha1 
-    group: example.com 
-    kind: AccountService 
-    name: prod-account-service 
+  - version: v1alpha1
+    group: example.com
+    kind: AccountService
+    name: prod-account-service
 ----
 <1> Specifies a list of service resources.
 <2> The sample application that points to a Deployment or any other similar resource with an embedded PodSpec.
@@ -45,15 +45,15 @@ kind: ServiceBinding
 metadata:
   name: account-service
 spec:
-  application:  <1>
-    apiVersion: apps/v1
-    kind: Deployment
-    name: online-banking
-
   service:
     apiVersion: example.com/v1alpha1
     kind: AccountService
     name: prod-account-service
+
+  workload:  <1>
+    apiVersion: apps/v1
+    kind: Deployment
+    name: online-banking
 ----
 <1> The application resource is a deployment resource with the name `online-banking`.
 

docs/userguide/modules/exposing-binding-data/pages/provisioned-service.adoc

@@ -69,10 +69,10 @@ spec:
     apiVersion: example.com/v1alpha1
     kind: AccountService
     name: prod-account-service
-  application:
+  workload:
     apiVersion: apps/v1
     kind: Deployment
     name: nodejs-app
 ----
 
-This method exposes all the keys in the `production-db-secret` referenced `Secret` resource as binding data that is to be projected into the workload.
+This method exposes all the keys in the `production-db-secret` referenced `Secret` resource as binding data that is to be projected into the workload.