Updated file share swagger to point to correct file (Azure#18453)

Co-authored-by: gapra <gapra@microsoft.com>

Author: gapra-msft

sdk/storage/azure-storage-file-share/swagger/README.md

@@ -15,7 +15,7 @@ autorest --use=@microsoft.azure/autorest.java@3.0.4 --use=jianghaolu/autorest.mo
 
 ### Code generation settings
 ``` yaml
-input-file: https://raw.githubusercontent.com/Azure/azure-rest-api-specs/storage-dataplane-preview/specification/storage/data-plane/Microsoft.FileStorage/preview/2020-02-10/file.json
+input-file: https://raw.githubusercontent.com/Azure/azure-rest-api-specs/storage-dataplane-preview/specification/storage/data-plane/Microsoft.FileStorage/preview/2020-04-08/file.json
 java: true
 output-folder: ../
 namespace: com.azure.storage.file.share
@@ -26,7 +26,7 @@ license-header: MICROSOFT_MIT_SMALL
 add-context-parameter: true
 models-subpackage: implementation.models
 custom-types-subpackage: models
-custom-types: HandleItem,ShareFileHttpHeaders,ShareServiceProperties,ShareCorsRule,Range,FileRange,ClearRange,ShareFileRangeList,CopyStatusType,ShareSignedIdentifier,SourceModifiedAccessConditions,ShareErrorCode,StorageServiceProperties,ShareMetrics,ShareAccessPolicy,ShareFileDownloadHeaders,LeaseDurationType,LeaseStateType,LeaseStatusType,PermissionCopyModeType,ShareAccessTier
+custom-types: HandleItem,ShareFileHttpHeaders,ShareServiceProperties,ShareCorsRule,Range,FileRange,ClearRange,ShareFileRangeList,CopyStatusType,ShareSignedIdentifier,SourceModifiedAccessConditions,ShareErrorCode,StorageServiceProperties,ShareMetrics,ShareAccessPolicy,ShareFileDownloadHeaders,LeaseDurationType,LeaseStateType,LeaseStatusType,PermissionCopyModeType,ShareAccessTier,ShareRootSquash
 ```
 
 ### Query Parameters