JDK 8 code review request for 7132338 Use @code friendly idiom for '\' in javadoc

[Joe Darcy]

Hello,

Responding to some of code review feedback from Ulf about the unsigned 
API work, I've taken a pass at purging

<code>'\u0030'</code>

from the jdk repo's javadoc and replacing it with

     {@code '\u005Cu0030'}

since {@code} is generally preferable.

Webrev with these changes and other <code></code> => {@code} 
transformations at

     http://cr.openjdk.java.net/~darcy/7132338.0/

With these changes, the javadoc builds runs without additional warnings 
and a specdiff against a reference copy of the javadoc shows no 
unexpected changes.

Thanks,

-Joe