[TYPO] Replace Chinese colon by ASCII colon

README.md

@@ -241,7 +241,7 @@ The important configuration is listed as following.
 |shuffle server|[Uniffle Shuffle Server Guide](https://github.com/apache/incubator-uniffle/blob/master/docs/server_guide.md)|
 |client|[Uniffle Shuffle Client Guide](https://github.com/apache/incubator-uniffle/blob/master/docs/client_guide.md)|
 
-## Security：Hadoop kerberos authentication
+## Security: Hadoop kerberos authentication
 The primary goals of the Uniffle Kerberos security are:
 1. to enable secure data access for coordinator/shuffle-servers, like dynamic conf/exclude-node files stored in secured dfs cluster
 2. to write shuffle data to kerberos secured dfs cluster for shuffle-servers.

client-mr/src/main/java/org/apache/hadoop/mapreduce/task/reduce/RssBypassWriter.java

@@ -49,7 +49,7 @@ public static void write(MapOutput mapOutput, byte[] buffer) {
       throw new IllegalStateException("RSS does not support OnDiskMapOutput as shuffle ouput,"
         + " try to reduce mapreduce.reduce.shuffle.memory.limit.percent");
     } else {
-      throw new IllegalStateException("Merger reserve unknown type of MapOutput："
+      throw new IllegalStateException("Merger reserve unknown type of MapOutput: "
         + mapOutput.getClass().getCanonicalName());
     }
   }