Update batch-tx.js

[Reccetech]

Update example to show how to use setInnerTransactions method.

[lfdt-bot]

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[venilinvasilev]

LGTM

[ivaylonikolov7]

Can we update the PR title so we can follow the conventional commits convention. Maybe something like feat: add setInnertransactions example? All our other commits follow the conventional commits methodology. If we change the PR title when we squash the PR it will be merged into main with proper conventional commit in main.

[ivaylonikolov7]

Nit: I saw that you incremented the steps but there might be some duplication of Step 1: We have Step 1: once in the main function and then in the sub-examples functions.