fix: make addedinElement casing consistent

Author: aduh95

src/generators/legacy-html/utils/buildContent.mjs

@@ -110,7 +110,7 @@ const buildMetadataElement = node => {
 
     // Creates the added in element with the added in version
     const addedinElement = createElement('span', [
-      createElement('b', 'Added In: '),
+      'Added in: ',
       addedIn,
     ]);