message: fix operation name for docs
diff: "tags": [
  "ContentTypeContentItem"
  ],
  - "operationId": "ContentTypeContentItem_ListByService",
  + "operationId": "ContentItem_ListByService",
  "description": "Returns list of content items",
  "x-ms-examples": {
  "ApiManagementListContentTypeContentItems": {
  "tags": [
  "ContentTypeContentItem"
  ],
  - "operationId": "ContentTypeContentItem_GetEntityTag",
  + "operationId": "ContentItem_GetEntityTag",
  "description": "Returns content item metadata",
  "x-ms-examples": {
  "ApiManagementHeadContentTypeContentItem": {
  "tags": [
  "ContentTypeContentItem"
  ],
  - "operationId": "ContentTypeContentItem_Get",
  + "operationId": "ContentItem_Get",
  "description": "Returns content item details",
  "x-ms-examples": {
  "ApiManagementGetContentTypeContentItem": {
  "tags": [
  "ContentTypeContentItem"
  ],
  - "operationId": "ContentTypeContentItem_CreateOrUpdate",
  + "operationId": "ContentItem_CreateOrUpdate",
  "description": "Creates new content item",
  "x-ms-examples": {
  "ApiManagementCreateContentTypeContentItem": {
  "tags": [
  "ContentTypeContentItem"
  ],
  - "operationId": "ContentTypeContentItem_Delete",
  + "operationId": "ContentItem_Delete",
  "description": "Removes specified content item.",
  "x-ms-examples": {
  "ApiManagementDeleteContentTypeContentItem": {
  