Documentation fixes for PluginNetworkPermissionScope. (#6555)

Co-authored-by: Zsolt Kiraly <[email protected]>

Author: zkiraly

Sources/PackageDescription/PackageDescription.docc/Curation/PluginPermission.md

@@ -6,3 +6,7 @@
 
 - ``allowNetworkConnections(scope:reason:)``
 - ``writeToPackageDirectory(reason:)``
+
+### Allow network connection
+
+- ``PluginNetworkPermissionScope``

Sources/PackageDescription/Target.swift

@@ -1486,7 +1486,9 @@ public enum PluginPermission {
     case writeToPackageDirectory(reason: String)
 }
 
-/// The scope of a network permission. This can be none, local connections only, or all connections.
+/// The scope of a network permission.
+///
+/// The scope can be none, local connections only, or all connections.
 @available(_PackageDescription, introduced: 5.9)
 public enum PluginNetworkPermissionScope {
     /// Do not allow network access.