What changes were proposed in this pull request?

On configuration doc page:https://spark.apache.org/docs/latest/configuration.html
We mentioned spark.kryoserializer.buffer.max : Maximum allowable size of Kryo serialization buffer. This must be larger than any object you attempt to serialize. Increase this if you get a "buffer limit exceeded" exception inside Kryo.
from source code, it has hard coded upper limit :

val maxBufferSizeMb = conf.getSizeAsMb("spark.kryoserializer.buffer.max", "64m").toInt
if (maxBufferSizeMb >= ByteUnit.GiB.toMiB(2))
{ throw new IllegalArgumentException("spark.kryoserializer.buffer.max must be less than " + s"2048 mb, got: + $maxBufferSizeMb mb.") }

We should mention "this value must be less than 2048 mb" on the configuration doc page as well.

How was this patch tested?

None. Since it's minor doc change.

Test build #3514 has finished for PR 16412 at commit ca3e142.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

Merged to master