change "primary" to "master"

Author: ajlam

articles/mysql/concepts-data-in-replication.md

@@ -24,14 +24,14 @@ The main scenarios to consider using Data-in Replication are:
 ## Limitations and considerations
 
 ### Data not replicated
-The [*mysql system database*](https://dev.mysql.com/doc/refman/5.7/en/system-database.html) on the primary server is not replicated. Changes to accounts and permissions on the primary server are not replicated. If you create an account on the primary server and this account needs to access the replica server, then manually create the same account on the replica server side. To understand what tables are contained in the system database, see the [MySQL manual](https://dev.mysql.com/doc/refman/5.7/en/system-database.html).
+The [*mysql system database*](https://dev.mysql.com/doc/refman/5.7/en/system-database.html) on the master server is not replicated. Changes to accounts and permissions on the master server are not replicated. If you create an account on the master server and this account needs to access the replica server, then manually create the same account on the replica server side. To understand what tables are contained in the system database, see the [MySQL manual](https://dev.mysql.com/doc/refman/5.7/en/system-database.html).
 
 ### Requirements
-- The primary server version must be at least MySQL version 5.6. 
-- The primary and replica server versions must be the same. For example, both must be MySQL version 5.6 or both must be MySQL version 5.7.
+- The master server version must be at least MySQL version 5.6. 
+- The master and replica server versions must be the same. For example, both must be MySQL version 5.6 or both must be MySQL version 5.7.
 - Each table must have a primary key.
-- Primary server should use the MySQL InnoDB engine.
-- User must have permissions to configure binary logging and create new users on the primary server.
+- Master server should use the MySQL InnoDB engine.
+- User must have permissions to configure binary logging and create new users on the master server.
 
 ### Other
 - Data-in replication is only supported in General Purpose and Memory Optimized pricing tiers