RFR: 8247957: remove doclint support for HTML 4 [v5]

[Yoshiki Sato]

On Wed, 23 Dec 2020 15:53:00 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> \s was introduced as a valid escape character in JDK 15 as part of the support for Text Blocks. https://docs.oracle.com/javase/specs/jls/se15/html/jls-3.html#jls-EscapeSequence https://docs.oracle.com/javase/specs/jls/se14/preview/specs/text-blocks-jls.html#jls-3.10.7 FWIW, the escape sequence showed up with red squiggly lines in my IDE.
> […](#)

Ok.  I didn't know that.  When I change my project SDK to 14, the escape sequence showed up with red squiggly.

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PR: https://git.openjdk.java.net/jdk/pull/893