RFR (XS) 8155215: java.lang.String concatenation spec is unnecessarily strong

[Aleksey Shipilev]

Hi,

Please review this tiny spec improvement that syncs up JLS and
java.lang.String Javadoc. java.lang.String Javadoc unnecessarily locks
down the implementation details for String concat (e.g. usage of
StringBuilder):
  http://cr.openjdk.java.net/~shade/8155215/webrev.00/

I'll submit CCC as soon as we agree on wording.

Thanks,
-Aleksey