[LANG-1794] Fix Javadoc for RandomUtils.secure(), it incorrectly mentions securerandom.strongAlgorithms

[IcoreE]

[LANG-1794] (https://issues.apache.org/jira/browse/LANG-1794)

The current JavaDoc for RandomUtils.secure() states that it “uses an algorithms/providers specified in the securerandom.strongAlgorithms Security property.” This is misleading.

In reality:

1. RandomUtils.secure() uses new SecureRandom() and does not consult the securerandom.strongAlgorithms property.
2. The securerandom.strongAlgorithms property is only used by RandomUtils.secureStrong(), which internally calls SecureRandom.getInstanceStrong() to select a strong algorithm from the configured security providers

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[garydgregory]

@IcoreE
Thank you for the PR. Merged.