<Swing Dev> RFR: 8268087: Update documentation of the JPasswordField [v2]

[Sergey Bylokhov]

> Some useful documentation was added to the JPasswordField.

Sergey Bylokhov has updated the pull request incrementally with one additional commit since the last revision:

  Update JPasswordField.java

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4296/files
  - new: https://git.openjdk.java.net/jdk/pull/4296/files/ff208b78..c0b4ef3d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4296&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4296&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4296.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4296/head:pull/4296

PR: https://git.openjdk.java.net/jdk/pull/4296