RFR: 8257589: HotSpot Style Guide should link to rfc7282

[Kim Barrett]

Please review this change to the link for the definition of "rough consensus".
The current link is to a Wikipedia article that references rfc7282.  We should
instead link directly the the RFC.  This change was requested during the
review of JDK-8247976, but not made at that time. (I'm not sure whether it was
intentionally deferred or missed/forgotten.)

As this is a HotSpot Style Guide change, it requires reviewers who are HotSpot
Group Members, though comments from others are welcome.

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Commit messages:
 - update html
 - update rough consensus link

Changes: https://git.openjdk.java.net/jdk/pull/7693/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7693&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257589
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7693.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7693/head:pull/7693

PR: https://git.openjdk.java.net/jdk/pull/7693