fix: normalize p5 reference links in parameter sections

Fixes #674

The regex in normalizeP5ReferenceLinks() was capturing the 'p5'
prefix in the capture group, causing duplicate 'p5' in URLs.

Before: #/p5/rectMode -> /reference/p5/p5/rectMode/ (broken)
After:  #/p5/rectMode -> /reference/p5/rectMode/ (fixed)

Updated regex to exclude 'p5' from capture group while still
handling both dot notation (#/p5.Element) and slash notation
(#/p5/rectMode) patterns.

Author: rushdarshan

src/layouts/ReferenceItemLayout.astro

@@ -90,13 +90,13 @@ const { showBanner, englishUrl } = checkTranslationBanner(
   Astro.url.pathname,
   Astro.url.origin
 );
-// Normalizes malformed p5.* reference anchors (e.g. "#/p5.Element")
-// to proper reference routes ("/reference/p5/p5.Element/")
+// Normalizes malformed p5.* reference anchors (e.g. "#/p5.Element" or "#/p5/rectMode")
+// to proper reference routes ("/reference/p5/p5.Element/" or "/reference/p5/rectMode/")
 function normalizeP5ReferenceLinks(html: string | undefined): string | undefined {
   if (!html) return html;
   return html.replace(
-    /href="#\/(p5\.[^"]+)"/g,
-    'href="/reference/p5/$1/"'
+    /href="#\/p5([.\/][^"]+)"/g,
+    'href="/reference/p5$1/"'
   );
 }
 ---