RFR: JDK-8282811: Typo in IAE details message of `RecordedObject.getValueDescriptor`

[Christian Stein]

Remove superfluous `"` from the beginning of the illegal argument exception's details message.

https://bugs.openjdk.java.net/browse/JDK-8282811

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Commit messages:
 - Remove superfluous `\"` from details message

Changes: https://git.openjdk.java.net/jdk/pull/7745/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7745&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282811
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7745.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7745/head:pull/7745

PR: https://git.openjdk.java.net/jdk/pull/7745