RFR: 8283049: Fix non-singleton LoggerFinder error message: s/on/one [v2]

[Carter Kozak]

> 8283049: Fix non-singleton LoggerFinder error message: s/on/one

Carter Kozak has updated the pull request incrementally with one additional commit since the last revision:

  Add 8283049 to LoggerFinderLoaderTest @bug docs

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7780/files
  - new: https://git.openjdk.java.net/jdk/pull/7780/files/a78180d5..8406b3e4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7780&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7780&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7780.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7780/head:pull/7780

PR: https://git.openjdk.java.net/jdk/pull/7780