RFR: JDK-8263137: Typos in sun.security.ssl.RenegoInfoExtension

[John Jiang]

Two typos on SCSV "signgling", which should be "signaling".

-------------

Commit messages:
 - JDK-8263137: Typos in sun.security.ssl.RenegoInfoExtension

Changes: https://git.openjdk.java.net/jdk/pull/2860/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2860&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263137
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2860.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2860/head:pull/2860

PR: https://git.openjdk.java.net/jdk/pull/2860