[8u60] Request for approval for multiple CRs CR 8034906 - Fix typos, errors and Javadoc differences in java.time

[Roger Riggs]

Please approve doc-only updates backported from JDK 9 in the java.time 
package.
They are applied essentially unchanged after unshuffling.

1)
8034906: Fix typos, errors and Javadoc differences in java.time
Reviewed-by: psandoz
changeset:
    http://hg.openjdk.java.net/jdk9/dev/jdk/rev/f3905a67a72c

2)
8068284: Missing @throws in DateTimeFormatterBuilder.appendOffset
8068285: Missing @throws in DateTimeFormatterBuilder.appendInstant
8062803: 'principal' should be 'principle' in java.time package description
8062796: java.time.format.DateTimeFormatter error in API doc example
Reviewed-by: lancea, mchung
changeset:
     http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/bd4d6a62e1fd

3)
8075678: java.time javadoc error in DateTimeFormatter::parsedLeapSecond
8075676: java.time package javadoc typos
8068276: java.time.chrono.HijrahChronology.eraOf() assertions may lead 
to misunderstanding
Reviewed-by: lancea, scolebourne
changeset:
     http://hg.openjdk.java.net/jdk9/dev/jdk/rev/83e0f851c7b8

Thanks, Roger