Update CODEOWNERS Azure SDK authN entry

Author: scottaddie

.github/CODEOWNERS

@@ -79,7 +79,7 @@
 /docs/azure/sdk/ @jsquire @alexwolfmsft @scottaddie @dotnet/docs
 
 # Azure SDK authentication topics
-/docs/azure/sdk/authentication/ @christothes @dotnet/docs @alexwolfmsft @scottaddie
+/docs/azure/sdk/authentication/ @JonathanCrd @christothes @dotnet/docs @alexwolfmsft @scottaddie
 
 # Azure SDK miscellaneous topics
 /docs/azure/sdk/azure-sdk-configure-proxy.md @annelo-msft @christothes @JoshLove-msft @KrzysztofCwalina @jsquire @alexwolfmsft @scottaddie @dotnet/docs