reduce repetitive phrasing in About the REST API

[Anujakhatri]

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Reworded the three bullet intros under "Getting started with the
REST API" in content/rest/about-the-rest-api/about-the-rest-api.md.
The phrase "you may find it helpful to refer to" was repeated across
all three, making the section feel repetitive. Each intro now uses
different, more direct phrasing. Also tightened the closing paragraph
about webhooks and GitHub Apps for conciseness. No changes to links,
front matter, or the "Further reading" section.

Before:

If you are new to REST APIs, you may find it helpful to refer
to the Quickstart or Getting Started guide for an introduction.

If you are familiar with REST APIs but new to GitHub's REST
API, you may find it helpful to refer to the authentication
documentation.

If you are building scripts or applications that use the
REST API, you may find some of the following guides helpful.

After:

If you are new to REST APIs, start with the Quickstart or
Getting Started guide.

If you are familiar with REST APIs but new to GitHub's REST
API, see the authentication documentation.

If you are building scripts or applications that use the
REST API, the following guides can help.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
rest/about-the-rest-api/about-the-rest-api.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[subatoi]

Hi @Anujakhatri I agree with your general assessment and the changes you've proposed to the first 3 paragraphs, but not the 4th. If you're happy to revert that last change, I can get this merged for you. Thanks!

[subatoi]

This is a matter of choice; I'd prefer to leave the original text here as some of the intended meaning is lost in the change