ci skip: Update README.md

Author: flowerinthenight

README.md

@@ -67,7 +67,7 @@ func main() {
 ```
 
 ## How it works
-The initial lock (the lock record doesn't exist in the table yet) is acquired by a process using an SQL `INSERT`. Once the record is created (by one process), all other `INSERT` attempts will fail. In this phase, **the commit timestamp of the locking process' transaction will be equal to the timestamp stored in the `token` column (being able to do this in one atomic network call is a crucial part of the algorithm)**. This will serve as our fencing token in situations where multiple processes are somehow able to acquire a lock. Using this token, the real lock holder will start sending heartbeats by updating the `heartbeat` column.
+The initial lock (the lock record doesn't exist in the table yet) is acquired by a process using an SQL `INSERT`. Once the record is created (by one process), all other `INSERT` attempts will fail. In this phase, **the commit timestamp of the locking process' transaction will be equal to the timestamp stored in the** `token` **column (being able to do this in one atomic network call is a crucial part of the algorithm)**. This will serve as our fencing token in situations where multiple processes are somehow able to acquire a lock. Using this token, the real lock holder will start sending heartbeats by updating the `heartbeat` column.
 
 When a lock is active, all participating processes will detect if the lease has expired by checking the heartbeat against Spanner's current timestamp. If so (say, the active locker has crashed, or cancelled), another round of SQL `INSERT` is attempted, this time, using the name format `<lockname_current-lock-token>`. The process that gets the lock during this phase will then attempt to update the `token` column using its commit timestamp, thus, updating the fencing token. In the event that the original locker process recovers (if crashed), or continues after a stop-the-world GC pause, the latest token should invalidate its locking claim (its token is already outdated).