RFR: 8278255: add more warning text in ReentrantLock and ReentrantReadWriteLock [v2]

[Viktor Klang]

> This is an attempt to be more clear about recommendations on Lock usage.

Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:

  Update src/java.base/share/classes/java/util/concurrent/locks/ReentrantReadWriteLock.java
  
  Co-authored-by: Pavel Rappo <32523691+pavelrappo at users.noreply.github.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18974/files
  - new: https://git.openjdk.org/jdk/pull/18974/files/74c937a1..e416c59a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18974&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18974&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18974.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18974/head:pull/18974

PR: https://git.openjdk.org/jdk/pull/18974