Update punctuation in Angular UI section introduction

[Copilot]

Description

Addresses feedback on PR #24646 to use proper punctuation when introducing sections.

Changed line 354 in docs/en/modules/payment.md:

• Before: For Angular applications, you need to read and apply the steps explained in the following sections
• After: For Angular applications, you need to read and apply the steps explained in the following sections:

A colon is the standard punctuation for sentences that introduce subsequent sections.

Checklist

• I fully tested it as developer / designer and created unit / integration tests
• I documented it (or no need to document or I will create a separate documentation issue)

How to test it?

Documentation change only - review the updated line in docs/en/modules/payment.md at line 354.

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