[Documentation Bug] Broken link svm options link in README and graal 'option' needs clarification

[harikrishnan83]

Thank you for building this tool. It is immensely helpful.

What happened?

1. The link to svm options in README is broken.
2. Specifying multiple graal 'option's in not immediately clear. I specified all options space separated under single 'option' as shown below. And it failed with the error saying invalid configuration.

option "--no-fallback -H:ReflectionConfigurationFiles=$reflectConfig --initialize-at-run-time=io.netty.channel.kqueue.KQueueEventLoop"

After reading through GraalExtension I realised each of these needed to be specified in separate 'option'. Maybe it was just me. However it does not hurt to add some clarification here.

What did you want to happen?

1. Update broken link
2. Add documentation on how to pass multiple Graal options

Nice to have: Error message that guides users not to have more than two tokens separated by a space in one option instead of saying invalid configuration or file not found etc.