RFR 8068279: (typo in the spec) javax.script.ScriptEngineFactory.getLanguageName

[A. Sundararajan]

Please review a typo in javadoc comment..

http://cr.openjdk.java.net/~sundar/8068279/ for 
https://bugs.openjdk.java.net/browse/JDK-8068279

Thanks,
-Sundar