generate-async-methods for postgresqlflexibleserver (#23598)

Author: XiaofeiCao

specification/postgresql/resource-manager/readme.java.md

@@ -1,48 +1,7 @@
 ## Java
 
 These settings apply only when `--java` is specified on the command line.
-Please also specify `--azure-libraries-for-java-folder=<path to the root directory of your azure-libraries-for-java clone>`.
 
 ``` yaml $(java)
-azure-arm: true
-fluent: true
-namespace: com.microsoft.azure.management.postgresql
-license-header: MICROSOFT_MIT_NO_CODEGEN
-payload-flattening-threshold: 1
-tag: package-2020-01-01
-output-folder: $(azure-libraries-for-java-folder)/azure-mgmt-postgresql
-```
-
-### Java multi-api
-
-``` yaml $(java) && $(multiapi)
-batch:
-  - tag: package-2017-12-01-preview
-  - tag: package-2017-12-01
-```
-
-### Tag: package-2017-12-01-preview and java
-
-These settings apply only when `--tag=package-2017-12-01-preview --java` is specified on the command line.
-Please also specify `--azure-libraries-for-java-folder=<path to the root directory of your azure-sdk-for-java clone>`.
-
-``` yaml $(tag) == 'package-2017-12-01-preview' && $(java) && $(multiapi)
-java:
-  namespace: com.microsoft.azure.management.postgresql.v2017_12_01_preview
-  output-folder: $(azure-libraries-for-java-folder)/sdk/postgresql/mgmt-v2017_12_01_preview
-regenerate-manager: true
-generate-interface: true
-```
-
-### Tag: package-2017-12-01 and java
-
-These settings apply only when `--tag=package-2017-12-01 --java` is specified on the command line.
-Please also specify `--azure-libraries-for-java-folder=<path to the root directory of your azure-sdk-for-java clone>`.
-
-``` yaml $(tag) == 'package-2017-12-01' && $(java) && $(multiapi)
-java:
-  namespace: com.microsoft.azure.management.postgresql.v2017_12_01
-  output-folder: $(azure-libraries-for-java-folder)/sdk/postgresql/mgmt-v2017_12_01
-regenerate-manager: true
-generate-interface: true
-```
+generate-async-methods: true
+```