[FLINK-23841][doc]Modify incorrect English statements for page "execu…

[hapihu]

https://ci.apache.org/projects/flink/flink-docs-master/docs/dev/datastream/execution/execution_configuration/

docs/dev/datastream/execution/execution_configuration.md

The English statement in line 82 is not correct.

//line 82
Note that types registered with `registerKryoType()` are not available to Flink's Kryo serializer instance.
It should be modified as follows:

It should be modified as follows

Note that types registered with `registerKryoType()` are not available to Flink's POJO serializer instance.

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Last check on commit 46d899c (Tue Aug 17 16:24:44 UTC 2021)

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[tillrohrmann]

Thanks for the PR @hapihu and the review @infoverload. LGTM. Merging it now.