fix url typo

Author: ExplodingDragon

templates/package/content/arch.tmpl

@@ -40,7 +40,7 @@ Server = <origin-url data-url="{{AppSubUrl}}/api/packages/{{$.PackageDescriptor.
 		</div>
 		<div class="field">
 			<label>{{ctx.Locale.Tr "packages.registry.documentation" "Arch"
-				"https://forgejo.org/docs/latest/user/packages/arch/"}}</label>
+				"https://docs.gitea.com/usage/packages/arch/"}}</label>
 		</div>
 	</div>
 </div>