[8u60] Request for approval for 8068284 : Missing @throws in DateTimeFormatterBuilder.appendOffset

[Roger Riggs]

Please approve doc-only updates backported from JDK 9 in the java.time 
package.
(This update was applied to 9 before the src reorganization and does not 
require unshuffling)

8068284: Missing @throws in DateTimeFormatterBuilder.appendOffset
8062803: 'principal' should be 'principle' in java.time package description
8062796: java.time.format.DateTimeFormatter error in API doc example
Reviewed-by: lancea, mchung

jdk8u patch:
    http://cr.openjdk.java.net/~rriggs/webrev-8068284-typos/

jdk 9 changeset:
     http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/bd4d6a62e1fd

Thanks, Roger

p.s The fix for 8068285: Missing @throws in 
DateTimeFormatterBuilder.appendInstant
is removed as it was identified formally as a spec change and not 
allowed for a backport.
The behavior of appendInstant is unchanged but is not specified.