Change secondary to replica and use primary as an adjective consistently

content/en/examples/application/mysql/mysql-configmap.yaml

@@ -9,8 +9,8 @@ data:
     # Apply this config only on the primary.
     [mysqld]
     log-bin
-  secondary.cnf: |
-    # Apply this config only on secondaries.
+  replica.cnf: |
+    # Apply this config only on replicas.
     [mysqld]
     super-read-only
 

content/en/examples/application/mysql/mysql-statefulset.yaml

@@ -31,7 +31,7 @@ spec:
           if [[ $ordinal -eq 0 ]]; then
             cp /mnt/config-map/primary.cnf /mnt/conf.d/
           else
-            cp /mnt/config-map/secondary.cnf /mnt/conf.d/
+            cp /mnt/config-map/replica.cnf /mnt/conf.d/
           fi
         volumeMounts:
         - name: conf
@@ -108,7 +108,7 @@ spec:
           # Determine binlog position of cloned data, if any.
           if [[ -f xtrabackup_slave_info && "x$(<xtrabackup_slave_info)" != "x" ]]; then
             # XtraBackup already generated a partial "CHANGE MASTER TO" query
-            # because we're cloning from an existing secondary. (Need to remove the tailing semicolon!)
+            # because we're cloning from an existing replica. (Need to remove the tailing semicolon!)
             cat xtrabackup_slave_info | sed -E 's/;$//g' > change_master_to.sql.in
             # Ignore xtrabackup_binlog_info in this case (it's useless).
             rm -f xtrabackup_slave_info xtrabackup_binlog_info