Remove incorrect statement from BugPattern index doc

[elkkhan]

#4248

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[elkkhan]

@cushon I'm unfamiliar with CI/CD of google opensource - do I need to something else for this to be merged or is copybara going to take care of it?

[cushon]

@cushon I'm unfamiliar with CI/CD of google opensource - do I need to something else for this to be merged or is copybara going to take care of it?

There's an internal review process before it's merged. You don't need to do anything else, thanks!