[wwwdocs] gcc-14/changes.html: Mention OpenACC 2.7's 'readonly' modifier

[wwwdocs] gcc-14/changes.html: Mention OpenACC 2.7's 'readonly' modifier

[Tobias Burnus]

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Minor OpenACC 2.7 update to https://gcc.gnu.org/gcc-14/changes.html#openacc

The 'readonly' modifier is now in (well, since March), albeit more 2.7 
features are in the pipeline...

Comments, remarks, suggestions before I commit it?

Tobias

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gcc-14/changes.html: Mention OpenACC 2.7's 'readonly' modifier

diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
index 045893cf..58f153ec 100644
--- a/htdocs/gcc-14/changes.html
+++ b/htdocs/gcc-14/changes.html
@@ -121,7 +121,9 @@ a work-in-progress.</p>
   <ul>
     <li>OpenACC 2.7: The <code>self</code> clause was added to be used on
       compute constructs and the <code>default</code> clause for data
-      constructs.</li>
+      constructs. Additionally, the <code>readonly</code> modifier is now
+      handled in the <code>copyin</code> clause and <code>cache</code>
+      directive.</li>
     <li>OpenACC 3.2: The following API routines are now available in
       Fortran using the <code>openacc</code> module or the
       <code>openacc_lib.h</code> header file: