Meta/3.15.1 (#2944)

* Update Discord.Net.targets

* Update docfx.json

* Update Discord.Net.nuspec

* Update CHANGELOG.md

docs/docfx.json

@@ -59,7 +59,7 @@
     "globalMetadata": {
       "_appTitle": "Discord.Net Documentation",
       "_appName": "Discord.Net",
-      "_appFooter": "Discord.Net © 2015-2024 3.15.0",
+      "_appFooter": "Discord.Net © 2015-2024 3.15.1",
       "_enableSearch": true,
       "_appLogoPath": "marketing/logo/SVG/Logomark Purple.svg",
       "_appFaviconPath": "favicon.png"