[spelling-mistake] Fix minor spelling mistake in Typescript Walkthrough Step 8

[Abdullah-Abuzaid]

Fix minor spelling mistake oder to order

This is related to issue #200

[cla-assistant]

All committers have signed the CLA.

[KvM2]

Hi @Abdullah-Abuzaid , thanks for your contribution! We'll take a look at it and get back to you.

[KlattG]

Fixed with the next UI5 release.

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