Remove name property from endpoint create/update API

`endpoint` doesn't need `name` property by default, remove
them from the doc, this change make it align with V3 API SPEC.

Change-Id: I61429b39086d15aed7d2315d7c3971727a9fa419

api-ref/source/v3/samples/admin/endpoint-create-request.json

@@ -1,7 +1,6 @@
 {
     "endpoint": {
         "interface": "public",
-        "name": "ec2-2",
         "region_id": "RegionOne",
         "url": "http://example.com/identity/v3/endpoints/828384",
         "service_id": "9242e05f0c23467bbd1cf1f7a6e5e596"

api-ref/source/v3/samples/admin/endpoint-update-response.json

@@ -5,7 +5,6 @@
         "links": {
             "self": "http://example.com/identity/v3/endpoints/828384"
         },
-        "name": "the internal volume endpoint",
         "region_id": "north",
         "service_id": "686766",
         "url": "http://example.com/identity/v3/endpoints/828384"

api-ref/source/v3/service-catalog.inc

@@ -150,7 +150,6 @@ Request
 .. rest_parameters:: parameters.yaml
 
    - endpoint: endpoint
-   - name: name
    - url: url
    - region: region
    - interface: interface
@@ -169,7 +168,6 @@ Response Parameters
 .. rest_parameters:: parameters.yaml
 
    - endpoint: endpoint
-   - name: name
    - links: links
    - url: url
    - region: region
@@ -257,7 +255,6 @@ Request
 .. rest_parameters:: parameters.yaml
 
    - endpoint: endpoint
-   - name: name
    - url: url
    - enabled: enabled
    - interface: interface
@@ -276,7 +273,6 @@ Response Parameters
 .. rest_parameters:: parameters.yaml
 
    - endpoint: endpoint
-   - name: name
    - links: links
    - url: url
    - region: region