A DESCRIPTION OF THE PROBLEM :
The example code of java.lang.DecimalFormat contains the HTML tags `<strong>` and `</strong>` in the example code:
> <strong>// Print out a number using the localized number, integer, currency,
> // and percent format for each locale</strong>
https://docs.oracle.com/en/java/javase/14/docs/api/java.base/java/text/DecimalFormat.html

The reason for this is that at some point a {@code } was added to the example code block which therefore treats the HTML tags inside literally.