Spring Fix typo regarding Ordered interface in core-aop.adoc

I believe there is a typo in core-aop.adoc, org.springframework.core.Ordered defines getOrder, not getValue.

Comment From: pivotal-issuemaster

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Comment From: pivotal-issuemaster

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Comment From: sokrato

@pivotal-issuemaster This is an Obvious Fix

Comment From: sbrannen

This has been merged into master.

Thanks