RFR: JDK-8285977: Add links to IEEE 754 specification

[Joe Darcy]

Please review the addition of @-see links from classes that mention the IEEE 754 floating-point standard to an IEEE page about the standard. The URL in the initial version of the PR is the top search result on the IEEE home page for "754 standard".

Another candidate page to use is

https://ieeexplore.ieee.org/servlet/opac?punumber=8766227

which is (apparently) a stable citation page for the standard.

These links may be upgraded to the the forthcoming @-spec facility in the future. ( JDK-6251738).

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Commit messages:
 - JDK-8285977: Add links to IEEE 754 specification

Changes: https://git.openjdk.java.net/jdk/pull/8511/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8511&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285977
  Stats: 21 lines in 7 files changed: 21 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8511.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8511/head:pull/8511

PR: https://git.openjdk.java.net/jdk/pull/8511