Fix Incorrect Definition in init Function

[hhelibeb]

The function defination of init in doc is inconsistent with the actual code, the later one is right.

I think both init () { } and init: () => { } are right, but init: () { } is not.

[cla-assistant]

All committers have signed the CLA.

[KvM2]

Hi @hhelibeb , thanks for your contribution . We appreciate it and will look into this.

[KlattG]

Fixed with one of the next patch sets / next release

[sap-doc-bot]

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[hhelibeb]

https://people.sap.com/marspark