RFR: 8264779: Fix doclint warnings in java/nio [v2]

[Iris Clark]

On Wed, 7 Apr 2021 14:40:48 GMT, Conor Cleary <ccleary at openjdk.org> wrote:

>> This fix addresses the following warnings which were generated by building JDK API documentation with the `-Xdoclint:all` option enabled:
>> 
>> ./build/linux-x64/support/gensrc/java.base/java/nio/charset/IllegalCharsetNameException.java:47: warning: no comment
>>     private String charsetName;
>>                    ^
>> ./open/src/java.base/share/classes/java/nio/charset/MalformedInputException.java:44: warning: no comment
>>     private int inputLength;
>>                 ^
>> ./open/src/java.base/share/classes/java/nio/charset/UnmappableCharacterException.java:44: warning: no comment
>>     private int inputLength;
>>                 ^
>> ./build/linux-x64/support/gensrc/java.base/java/nio/charset/UnsupportedCharsetException.java:47: warning: no comment
>>     private String charsetName;
>>                    ^
>> ./open/src/java.base/share/classes/java/nio/file/DirectoryIteratorException.java:81: warning: no @param for s
>>     private void readObject(ObjectInputStream s)
>>                  ^
>> ./open/src/java.base/share/classes/java/nio/file/DirectoryIteratorException.java:81: warning: no @throws for java.lang.ClassNotFoundException
>>     private void readObject(ObjectInputStream s)
>>                  ^
>> ./open/src/java.base/share/classes/java/nio/file/FileSystemException.java:43: warning: no comment
>>     private final String file;
>>                          ^
>> ./open/src/java.base/share/classes/java/nio/file/FileSystemException.java:44: warning: no comment
>>     private final String other;
>>                          ^
>> ./open/src/java.base/share/classes/java/nio/file/InvalidPathException.java:43: warning: no comment
>>     private int index;
>>                 ^
>> ./open/src/java.base/share/classes/java/nio/file/InvalidPathException.java:42: warning: no comment
>>     private String input;
>>                    ^
>> ./open/src/java.base/share/classes/java/nio/file/attribute/UserPrincipalNotFoundException.java:43: warning: no comment
>>     private final String name;
>>                          ^
>> Changes to [`genExceptions.sh`](https://github.com/openjdk/jdk/commit/b729d8ed7970737a8a2d4e8aa788df33789faea2) and the two [`exceptions`](https://github.com/openjdk/jdk/commit/b729d8ed7970737a8a2d4e8aa788df33789faea2) templates are to address the warnings concerned with `UnsupportedCharsetException.java` and `IllegalCharsetNameException.java` which are generated when `make jdk-image` is run. A CSR will be filed in due course with respect to these changes.
>
> Conor Cleary has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8264779: Simplified comments

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/3376