[DOCUMENTATION] Fix minor doc error

Author: Jeff Zhang <zjffdu@apache.org>

Closes #9956 from zjffdu/dev_typo.

docs/configuration.md

@@ -35,7 +35,7 @@ val sc = new SparkContext(conf)
 {% endhighlight %}
 
 Note that we can have more than 1 thread in local mode, and in cases like Spark Streaming, we may
-actually require one to prevent any sort of starvation issues.
+actually require more than 1 thread to prevent any sort of starvation issues.
 
 Properties that specify some time duration should be configured with a unit of time.
 The following format is accepted: