RFR: 8341566: Add Reader.of(CharSequence) [v7]

[Chen Liang]

On Wed, 9 Oct 2024 18:40:34 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Markus KARG has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - assertThrows instead of expectedExceptions
>>  - ordered jtreg tags according recommendation in https://openjdk.org/jtreg/tag-spec.html#ORDER
>
> src/java.base/share/classes/java/io/Reader.java line 161:
> 
>> 159:      * {@code transferTo()} methods all throw {@code IOException}.
>> 160:      *
>> 161:      * <p> The returned reader supports the {@link #mark mark()} operation.
> 
> It may be useful to mention and link to the #reset method as well.

I think `mark()`'s specification implies that if mark is supported, then `reset()` can be called. We can make that explicit on `mark()`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21371#discussion_r1794110239