Update 2023-09-05-why-uu.md (#1061)

Wrong spelling of possessive its.

Author: bradfitz

blog/2023-09-05-why-uu.md

@@ -6,7 +6,7 @@ Many thanks to [@tertsdiepraam], from the `uutils` team, and nushell + coreutils
 
 ## But why?
 
-Nushell has been around since it's first public release on August 23rd, 2019. I think it's pretty safe to say that the concept of nushell has remained the same throughout the years, but wow have the internals changed. We've added commands, polished commands, removed commands, all to make nushell more composable and cohesive.
+Nushell has been around since its first public release on August 23rd, 2019. I think it's pretty safe to say that the concept of nushell has remained the same throughout the years, but wow have the internals changed. We've added commands, polished commands, removed commands, all to make nushell more composable and cohesive.
 
 The story with open source remains the same. Contributors from a variety of backgrounds come in and submit pull requests. These PRs are usually things that author enjoys working on, because, let's admit it, people work on what they love and where their interest lies.