Revise docs according to the comments.

Author: dongjoon-hyun

docs/sql-programming-guide.md

@@ -1413,12 +1413,13 @@ options.
  - Dataset and DataFrame API `explode` has been deprecated, alternatively, use `functions.explode()` with `select` or `flatMap`
  - Dataset and DataFrame API `registerTempTable` has been deprecated and replaced by `createOrReplaceTempView`
 
- - Changes to `CREATE TABLE ... LOCATION` behavior.
+ - Changes to `CREATE TABLE ... LOCATION` behavior for Hive tables.
     - From Spark 2.0, `CREATE TABLE ... LOCATION` is equivalent to `CREATE EXTERNAL TABLE ... LOCATION`
       in order to prevent accidental dropping the existing data in the user-provided locations.
-      Please see [SPARK-15276](https://issues.apache.org/jira/browse/SPARK-15276) for details.
+      That means, a Hive table created in Spark SQL with the user-specified location is always a Hive external table.
+      Dropping external tables will not remove the data. Users are not allowed to specify the location for Hive managed tables.
+      Note that this is different from the Hive behavior.
     - As a result, `DROP TABLE` statements on those tables will not remove the data.
-      Note that this is different than the Hive behavior.
 
 ## Upgrading From Spark SQL 1.5 to 1.6