Update get-started.mdx

[Shad0wKillar]

We were using .run() instead of .all()
If my knowledge is correct:

1. we use .all() for SELECT queries to get the actual rows.
2. we use .run() is for INSERT/UPDATE/DELETE and returns metadata.

In the description below, we were explaining for ".all()" but were using ".run()" in actual code.

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Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[Oxyjun]

Hi, thanks for flagging that we're still describing the use of all() in the text below.

To clarify: .all() is an alias for .run(), as they are functionally identical.

I've created a PR here #24172 to align to run(), which is our recommended syntax.

I hope this helps!