docs: Standardize Fedora OS version references and update IOMMU kernel parameter from amd_iommu=off to iommu=pt in documentation.

docs/index.html

@@ -506,7 +506,7 @@
                 </div>
                 <div class="sys-item">
                     <span class="sys-label">OS/Kernel</span>
-                    <span>Fedora 43 (Rawhide) · Linux 6.18.5-200.fc43.x86_64</span>
+                    <span>Fedora 43 · Linux 6.18.5-200.fc43.x86_64</span>
                 </div>
                 <div class="sys-item">
                     <span class="sys-label">Interconnect</span>