da51cf58fc
In DataFrame.scala, there are examples like as follows.
```
* // The following are equivalent:
* peopleDf.filter($"age" > 15)
* peopleDf.where($"age" > 15)
* peopleDf($"age" > 15)
```
But, I think the last example doesn't work.
Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>
Closes #6977 from sarutak/fix-dataframe-example and squashes the following commits:
46efbd7 [Kousuke Saruta] Removed wrong example
(cherry picked from commit
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