doc fixes

Author: prakharjain09

core/src/main/scala/org/apache/spark/internal/config/package.scala

@@ -1846,9 +1846,9 @@ package object config {
     ConfigBuilder("spark.executor.decommission.killInterval")
       .doc("Duration after which a decommissioned executor will be killed forcefully." +
         "This config is useful for cloud environments where we know in advance when " +
-        "an executor is going to go down after decommissioning signal Ex- around 2 mins " +
+        "an executor is going to go down after decommissioning signal i.e. around 2 mins " +
         "in aws spot nodes, 1/2 hrs in spot block nodes etc. This config is currently " +
-        "used to decide what tasks running on decommission executors to speculate")
+        "used to decide what tasks running on decommission executors to speculate.")
       .version("3.1.0")
       .timeConf(TimeUnit.SECONDS)
       .createOptional