RFR: 8341907: javac -Xlint should ignore /// on first line of source file [v2]

[Jonathan Gibbons]

On Wed, 6 Nov 2024 22:58:21 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

>  If you propose such a way, I'd happily incorporate it.

Does the content of the comment (`c.getText()`) contain a newline character that is not at the end of the content?  Maybe something like 
  `c.getText().matches("(?s)\\R.")` 
although there may be more effective ways to do that.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21923#discussion_r1831878566