fix without other formatting changes

Author: mvadari

XLS-0006-visual-account-icons/README.md

@@ -2,7 +2,7 @@
   xls: 6
   title: Standard for Visual Account Icons
   description: A standard for visually distinguishing XRPL accounts by generating unique icons for each account, regardless of address format.
-  author: Richard Holland (RichardAH)
+  author: Richard Holland (@RichardAH)
   discussion-from: https://github.com/XRPLF/XRPL-Standards/discussions/24
   status: Final
   category: Community

XLS-0022-api-versioning/README.md

@@ -2,7 +2,7 @@
   xls: 22
   title: rippled API Versioning
   description: The API version number allows for evolving the `rippled` API while maintaining backward compatibility
-  author: Elliot Lee (intelliot), Peng Wang (pwang200)
+  author: Elliot Lee (@intelliot), Peng Wang (@pwang200)
   status: Final
   category: Protocol
   created: 2021-08-11

XLS-0025-enhanced-secret-numbers/README.md

@@ -2,7 +2,7 @@
   xls: 25
   title: Enhanced Secret Numbers
   description: Enhances XLS-12 secret number format by introducing an additional block for encoding ancillary information, and supporingt for longer secrets.
-  author: Nik Bougalis (nikb@bougalis.net)
+  author: Nik Bougalis <nikb@bougalis.net>
   status: Final
   category: Community
   created: 2021-12-10

XLS-0041-xpop/README.md

@@ -1,7 +1,7 @@
 <pre>
     xls: 41
     title: XRPL Proof of Payment Standard (XPOP)
-    author: Richard Holland (RichardAH)
+    author: Richard Holland (@RichardAH)
 	description: An offline non-interactive cryptographic proof that a transaction was successfully submitted to the XRP Ledger and what its impact (metadata) was
     created: 2023-05-04
     status: Final

XLS-0069-simulate/README.md

@@ -2,7 +2,7 @@
   xls: 69
   title: Simulating Transaction Execution
   description: A new API method for executing dry runs of transactions without submitting them to the network
-  author: Mayukha Vadari <mvadari@ripple.com>, Elliot Lee (intelliot)
+  author: Mayukha Vadari <mvadari@ripple.com>, Elliot Lee (@intelliot)
   discussion-from: https://github.com/XRPLF/XRPL-Standards/discussions/199
   status: Final
   category: Protocol