Fix typos in release notes (pingcap#4615)

releases/release-5.0.0-rc.md

@@ -13,9 +13,9 @@ TiDB v5.0.0-rc is the predecessor version of TiDB v5.0. In v5.0, PingCAP will be
 In v5.0, the key new features or improvements are as follows:
 
 + Clustered index. When this feature is enabled, database performance is improved. For example, in the TPC-C tpmC test, TiDB's performance, with clustered index enabled, improves by 39%.
-+ Asynchronous commit or async commit. When this feature is enabled, the write latency is reduced. For example, in the Sysbench olpt-insert test, the write latency of TiDB, with async commit enabled, is reduced by 37.3%.
++ Async commit. When this feature is enabled, the write latency is reduced. For example, in the Sysbench olpt-insert test, the write latency of TiDB, with async commit enabled, is reduced by 37.3%.
 + Reduced jitters. This is achieved by improving the optimizer stability and by limiting system tasks' usages of I/O, network, CPU, and memory resources. For example, in the 72-hour performance test, the standard deviation of Sysbench TPS jitter is reduced from 11.09% to 3.36%.
-+ Raft Join Consensus algorithm, which ensures the system availability during the Region membership change.
++ Raft Joint Consensus algorithm, which ensures the system availability during the Region membership change.
 + Optimized `EXPLAIN` features and invisible index, which helps Database Administrators (DBAs) debug SQL statements more efficiently.
 + Guaranteed reliability for enterprise data. You can back up data from TiDB to AWS S3 storage and Google Cloud GCS, or restore data from these cloud storage platforms.
 + Improved performance of data import from or data export to AWS S3 storage or TiDB/MySQL, which helps enterprises quickly build applications on the cloud. For example, in the TPC-C test, the performance of importing 1 TiB data improves by 40%, from 254 GiB/h to 366 GiB/h.