<AWT Dev> [14] RFR JDK-8231144: Wrap contents of plain HTML files into contentContainer

[Alexey Ivanov]

Hello,

Please review the following simple fix for JDK 14:

bug: https://bugs.openjdk.java.net/browse/JDK-8231144
webrev: http://cr.openjdk.java.net/~aivanov/8231144/webrev.00/
docs: 
http://cr.openjdk.java.net/~aivanov/8231144/docs.00/api/java.desktop/module-summary.html

Plain HTML documentation files have no left margin after processing by 
javadoc. It does not look good. For example, see the following files in 
JDK 13 API reference:
https://docs.oracle.com/en/java/javase/13/docs/api/java.desktop/javax/imageio/metadata/doc-files/gif_metadata.html
https://docs.oracle.com/en/java/javase/13/docs/api/java.desktop/java/awt/doc-files/Modality.html

This simple fix wraps the entire content of the file, between <main> and 
</main>, into <div class="contentContainer"> and </div> which provide 
the margins for class descriptions. Thus, these HTML documentation files 
look consistently, they're also easier to read:
http://cr.openjdk.java.net/~aivanov/8231144/docs.00/api/java.desktop/javax/imageio/metadata/doc-files/gif_metadata.html
http://cr.openjdk.java.net/~aivanov/8231144/docs.00/api/java.desktop/java/awt/doc-files/Modality.html


I attached the screenshots of gif_metadata.html displayed in src, api 
reference, and api reference with the fix applied.

-- 
Regards,
Alexey