Some fixes in kn domain help messages (#1283)

Author: rhuss

docs/cmd/kn_domain_describe.md

@@ -6,6 +6,14 @@ Show details of a domain mapping
 kn domain describe NAME
 ```
 
+### Examples
+
+```
+
+  # Show details of for the domain 'hello.example.com'
+  kn domain describe hello.example.com
+```
+
 ### Options
 
 ```

docs/cmd/kn_domain_list.md

@@ -14,7 +14,7 @@ kn domain list
   kn domain list
 
   # List all domain mappings in JSON output format
-  kn revision list -o json
+  kn domain list -o json
 ```
 
 ### Options

pkg/kn/commands/domain/describe.go

@@ -35,6 +35,9 @@ func NewDomainMappingDescribeCommand(p *commands.KnParams) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "describe NAME",
 		Short: "Show details of a domain mapping",
+		Example: `
+  # Show details of for the domain 'hello.example.com'
+  kn domain describe hello.example.com`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if len(args) != 1 {
 				return errors.New("'kn domain describe' requires name of the domain mapping as single argument")

pkg/kn/commands/domain/list.go

@@ -35,7 +35,7 @@ func NewDomainMappingListCommand(p *commands.KnParams) *cobra.Command {
   kn domain list
 
   # List all domain mappings in JSON output format
-  kn revision list -o json`,
+  kn domain list -o json`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			namespace, err := p.GetNamespace(cmd)
 			if err != nil {