Fix the markup of the config example in the mmts README.

Author: kvap

README.md

@@ -6,37 +6,37 @@ An implementation of synchronous multi-master replication based on **logical dec
 
 1. Install `contrib/raftable` and `contrib/mmts` on each instance.
 1. Add these required options to the `postgresql.conf` of each instance in the cluster.
-	```sh
-	max_prepared_transactions = 200 # should be > 0, because all
-									# transactions are implicitly two-phase
-	max_connections = 200
-	max_worker_processes = 100 # at least (2 * n + p + 1)
-							   # this figure is calculated as:
-							   #   1 raftable worker
-							   #   n-1 receiver
-							   #   n-1 sender
-							   #   1 mtm-sender
-							   #   1 mtm-receiver
-							   #   p workers in the pool
-	max_parallel_degree = 0
-	wal_level = logical # multimaster is build on top of
-						# logical replication and will not work otherwise
-	max_wal_senders = 10 # at least the number of nodes
-	wal_sender_timeout = 0
-	default_transaction_isolation = 'repeatable read'
-	max_replication_slots = 10 # at least the number of nodes
-	shared_preload_libraries = 'raftable,multimaster'
-	multimaster.workers = 10
-	multimaster.queue_size = 10485760 # 10mb
-	multimaster.node_id = 1 # the 1-based index of the node in the cluster
-	multimaster.conn_strings = 'dbname=... host=....0.0.1 port=... raftport=..., ...'
-							   # comma-separated list of connection strings
-	multimaster.use_raftable = true
-	multimaster.heartbeat_recv_timeout = 1000
-	multimaster.heartbeat_send_timeout = 250
-	multimaster.ignore_tables_without_pk = true
-	multimaster.twopc_min_timeout = 2000
-	```
+```sh
+max_prepared_transactions = 200 # should be > 0, because all
+								# transactions are implicitly two-phase
+max_connections = 200
+max_worker_processes = 100 # at least (2 * n + p + 1)
+						   # this figure is calculated as:
+						   #   1 raftable worker
+						   #   n-1 receiver
+						   #   n-1 sender
+						   #   1 mtm-sender
+						   #   1 mtm-receiver
+						   #   p workers in the pool
+max_parallel_degree = 0
+wal_level = logical # multimaster is build on top of
+					# logical replication and will not work otherwise
+max_wal_senders = 10 # at least the number of nodes
+wal_sender_timeout = 0
+default_transaction_isolation = 'repeatable read'
+max_replication_slots = 10 # at least the number of nodes
+shared_preload_libraries = 'raftable,multimaster'
+multimaster.workers = 10
+multimaster.queue_size = 10485760 # 10mb
+multimaster.node_id = 1 # the 1-based index of the node in the cluster
+multimaster.conn_strings = 'dbname=... host=....0.0.1 port=... raftport=..., ...'
+						   # comma-separated list of connection strings
+multimaster.use_raftable = true
+multimaster.heartbeat_recv_timeout = 1000
+multimaster.heartbeat_send_timeout = 250
+multimaster.ignore_tables_without_pk = true
+multimaster.twopc_min_timeout = 2000
+```
 1. Allow replication in `pg_hba.conf`.
 
 ## Status functions