[unit test][ssl cert] added a comment for creates_different_certs_per…

…_server_name unit test.

tests/test_ssl_cert_provider.cpp

@@ -98,6 +98,7 @@ TEST_F(SSLCertProviderFixture, persists_cert_and_key)
 TEST_F(SSLCertProviderFixture, creates_different_certs_per_server_name)
 {
     const auto [mock_platform, _] = mpt::MockPlatform::inject<NiceMock>();
+    // move the multipass_root_cert.pem into the temporary directory so it will be deleted automatically later
     EXPECT_CALL(*mock_platform, get_root_cert_path())
         .WillRepeatedly(Return(std::filesystem::path{cert_dir.toStdU16String()} / "multipass_root_cert.pem"));