RFR: 8220730: sun.security.provider.SecureRandom default constructor has wrong documentation

[Bradford Wetmore]

This is to fix some out-of-date information in the javadoc for the SHA1PRNG that has generated a customer bug.

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Commit messages:
 - 8220730: sun.security.provider.SecureRandom default constructor has wrong documentation

Changes: https://git.openjdk.java.net/jdk/pull/1461/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1461&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8220730
  Stats: 9 lines in 1 file changed: 4 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1461.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1461/head:pull/1461

PR: https://git.openjdk.java.net/jdk/pull/1461