RFR: 8279794: Fix typos in BasicScrollBarUI: Laysouts a vertical scroll bar [v2]

[Alexey Ivanov]

> Fixed the typo in the layout methods: “Laysouts a…” → “Lays out a…”.
> 
> The doc for `layoutHScrollbar` incorrectly referred to _vertical_ scroll bar rather than horizontal one.
> 
> 
> I also expanded the wildcard imports.

Alexey Ivanov has updated the pull request incrementally with one additional commit since the last revision:

  Add a blank line between java- and javax-package classes

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7032/files
  - new: https://git.openjdk.java.net/jdk/pull/7032/files/f5f6be2b..c1806007

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7032&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7032&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7032.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7032/head:pull/7032

PR: https://git.openjdk.java.net/jdk/pull/7032