Update links for "How to Add Custom Properties to the User Entity" community article

[EngincanV]

https://community.abp.io/posts/how-to-add-custom-properties-to-the-user-entity-rixchoha

You might want to update the links on the article, because it's redirecting to the raw version of articles (github.com) (but those articles are already published on community.abp.io so it can be good to update them).

abp/docs/en/Community-Articles/2020-10-08-How-To-Add-Custom-Property-To-The-User-Entity/How-To-Add-Custom-Property-To-The-User-Entity.md

Line 9 in c81732c

> **Note:** This article is not about customizing the `Login` page. If you have such a need, please follow [this article](../2020-05-09-Customize-the-Login-Page-for-MVC-Razor-Page-Applications/POST.md).

---

Also, the second link is wrong right now. FYI.