Update memory.md

[dalibormesaric]

Updated size of string from 10KB to 20KB according to

Note: Strings are stored as UTF-16 characters in .NET so each char takes two bytes in memory.

but also after running

Console.WriteLine(
    System.Text.Encoding.Unicode.GetByteCount(
        new String('x', 10 * 1024)));

// Answer: 20480

---

Fixes #34052

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aspnetcore/performance/memory.md	Memory management and garbage collection (GC) in ASP.NET Core

[dalibormesaric]

Also created sebastienros/memoryleak#8

[Rick-Anderson]

Also created sebastienros/memoryleak#8

Issues should be created in this repo. I created #34052 for you.

Thanks so much for this valuable contribution.

Thanks for the contribution. Be sure to check out your name as a contributor about the 3rd of next month on the What's new page in the Community contributors section at the bottom.

Check out is:issue is:open label:"code help wanted" " and is:open is:issue label:"Good first issue" if you're interested it writing some code. We'll take care of the writing.