## What changes were proposed in this pull request?

This PR adds a new behavior change description on `CREATE TABLE ... LOCATION` at `sql-programming-guide.md` clearly under `Upgrading From Spark SQL 1.6 to 2.0`. This change is introduced at Apache Spark 2.0.0 as [SPARK-15276](https://issues.apache.org/jira/browse/SPARK-15276).

## How was this patch tested?

```
SKIP_API=1 jekyll build
```

**Newly Added Description**
<img width="913" alt="new" src="https://cloud.githubusercontent.com/assets/9700541/21743606/7efe2b12-d4ba-11e6-8a0d-551222718ea2.png">

Author: Dongjoon Hyun <dongjoon@apache.org>

Closes #16400 from dongjoon-hyun/SPARK-18941.