RFR: 8255690: &nbsp in StringBuilder.subSequence

[Brent Christian]

There are a couple of stray "&nbsp"'s in the StringBuilder.subSequence() documentation, which should be removed.  The updated doc build looks good.

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Commit messages:
 - remove nbsp from AbstractStringBuilder.subSequence()

Changes: https://git.openjdk.java.net/jdk/pull/963/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=963&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255690
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/963.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/963/head:pull/963

PR: https://git.openjdk.java.net/jdk/pull/963