fix typo for int literal

[MashalMohammed]

typo: 1_000 -> 1000

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docs/core/extensions/dependency-injection.md	.NET dependency injection

[pkulikov]

@MashalMohammed I don't think it's typo.

You can use the underscore symbol in integer literals:
https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/integral-numeric-types#integer-literals

So, most probably, the example uses 1_000 for better readability.

[MashalMohammed]

Oh my bad - closing the PR.
@pkulikov thanks for the clarification.