Several changes on Kontlin. (#2335)

* kotlin: remove unnecessary semicolons.

Also replace code block language `java` with `kotlin`.

* kotlin: change coding style (Kotlin Reference)

* kotlin: anonymous function -> lambda expression

Anonymous functions and lambda expressions are different in Kotlin.
The code example uses `anonymous function` in the comment,
while the code below is in fact lambda expressions.

* Remove myself from contributors.

Not for trivial changes.

* kotlin: fix a typo.

Thanks @geoffliu to point out this.

* kotlin: change style of default parameter according to Referenec.

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