removed Tech Preview items

Author: mportman12

supplementary_style_guide/introduction/whats-new.adoc

@@ -42,10 +42,9 @@ To view the history of changes from 2020 through 2022, see the link:https://gith
 * xref:rulebook[rulebook] Added glossary entry
 * xref:segmentation-fault[segmentation fault]: Updated glossary entry for clarity
 * xref:spec-file[spec file]: Updated glossary entry for clarity
-* xref:technology-preview[Technology Preview] Added glossary entry
+//
+//.Style guidance
 
-.Style guidance
-* xref:technology-preview-guidance[Technology Preview]: Added section with guidance on writing Technology Previews
 //
 // .Other updates
 // * TODO