Remove version_added from return values and docs fragments. (#150)

plugins/modules/database/mysql/mysql_db.py

@@ -251,13 +251,11 @@ db_list:
   returned: always
   type: list
   sample: ["foo", "bar"]
-  version_added: '2.9'
 executed_commands:
   description: List of commands which tried to run.
   returned: if executed
   type: list
   sample: ["CREATE DATABASE acme"]
-  version_added: '2.10'
 '''
 
 import os

plugins/modules/database/mysql/mysql_info.py

@@ -167,7 +167,6 @@ global_status:
   type: dict
   sample:
   - { "Innodb_buffer_pool_read_requests": 123, "Innodb_buffer_pool_reads": 32 }
-  version_added: "2.10"
 users:
   description: Users information.
   returned: if not excluded by filter

plugins/modules/database/mysql/mysql_replication.py

@@ -231,7 +231,6 @@ queries:
   returned: always
   type: list
   sample: ["CHANGE MASTER TO MASTER_HOST='master2.example.com',MASTER_PORT=3306"]
-  version_added: '2.10'
 '''
 
 import os

plugins/modules/database/mysql/mysql_variables.py

@@ -76,7 +76,6 @@ queries:
   returned: if executed
   type: list
   sample: ["SET GLOBAL `read_only` = 1"]
-  version_added: '2.10'
 '''
 
 import os