v5.2.0.M3 docs contain Deprecated example code

[pluttrell]

Summary

The Spring Security v5.2.0.M3 docs provides the following example:

static class GrantedAuthoritiesExtractor extends JwtAuthenticationConverter {
    protected Collection<GrantedAuthority> extractAuthorities(Jwt jwt) {
        Collection<String> authorities = (Collection<String>)
                jwt.getClaims().get("mycustomclaim");

        return authorities.stream()
                .map(SimpleGrantedAuthority::new)
                .collect(Collectors.toList());
    }
}

The Collection<GrantedAuthority> extractAuthorities(Jwt jwt) method is now deprecated. From looking at the source, it appears there's a new recommended way to introduce our own custom authority logic.

[jzheaux]

Thanks for the report, @pluttrell! Would you be interested in submitting a PR to update the docs?

[pluttrell]

@jzheaux I was thinking about submitting one, but wasn't 100% sure what the authors intent is and didn't want to lead people in the wrong direction.

[jzheaux]

I see, @pluttrell, I can understand you wanting to first assess the author's intent. Yes, I think you've understood it correctly, and the documentation just lagged behind #6277.

Let me know if you'd like to provide a PR, and I'd be happy to assist.

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