OpenCoreUefi: Clarify in err msgs that OC is bootstrapping secure boot NVRAM values

Makes it easier for end users to realise that e.g. invalid NVRAM contents can cause failures here

Library/OcMainLib/OpenCoreUefi.c

@@ -506,13 +506,13 @@ OcLoadAppleSecureBoot (
 
     Status = OcAppleImg4BootstrapValues (RealSecureBootModel, Config->Misc.Security.ApECID);
     if (EFI_ERROR (Status)) {
-      DEBUG ((DEBUG_ERROR, "OC: Failed to bootstrap IMG4 values - %r\n", Status));
+      DEBUG ((DEBUG_ERROR, "OC: Failed to bootstrap IMG4 NVRAM values - %r\n", Status));
       return;
     }
 
     Status = OcAppleSecureBootBootstrapValues (RealSecureBootModel, Config->Misc.Security.ApECID);
     if (EFI_ERROR (Status)) {
-      DEBUG ((DEBUG_ERROR, "OC: Failed to bootstrap SB values - %r\n", Status));
+      DEBUG ((DEBUG_ERROR, "OC: Failed to bootstrap SB NVRAM values - %r\n", Status));
       return;
     }
   }