RFR: 8356644: Update encoding declaration to UTF-8

Tue May 13 00:13:50 UTC 2025

On Fri, 9 May 2025 14:14:57 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> A handful of html and xml files in the JDK source tree claims to have encodings like `ISO-8859-1`, when they are in fact pure US-ASCII files.
> 
> While perhaps technically correct, this is misleading, and goes contrary to the efforts of turning the source code into UTF-8 proper.
> 
> I chose between marking them as "ASCII" and "UTF-8", but chose the latter, since otherwise if they ever were to be updated with a non-ASCII character, the value would have been unspecified, and after JDK-8301971, all files in the JDK repository will be interpreted as UTF-8.

src/demo/share/jfc/CodePointIM/README.html line 5:

> 3: <head>
> 4:   <title>README - CodePointIM</title>
> 5:   <meta http-equiv="content-type" content="text/html; charset=utf-8">

I believe this line is equivalent to simple `<meta charset="utf-8"/>` which is widely used in java.desktop's docs.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25148#discussion_r2085710719