[jdk15u-dev] RFR: 8248865: Document JNDI/LDAP timeout properties

[Alexey Bakhtin]

Clean backport.
Required for JDK-8245527

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Commit messages:
 - Backport d308558d4fb98fc85b6574a9de229b255fc7ee7c

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/144/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=144&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8248865
  Stats: 37 lines in 1 file changed: 35 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/144.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/144/head:pull/144

PR: https://git.openjdk.java.net/jdk15u-dev/pull/144