Replace links to variable pages with links to method pages

See #2196

content/en/functions/transform/HTMLUnescape.md

@@ -25,6 +25,6 @@ In most contexts Go's [html/template] package will escape special characters. To
 {{ htmlUnescape "Lilo & Stitch" | safeHTML }}
 ```
 
-[`safehtml`]: /functions/safe/html
+[`safehtml`]: /functions/safe/html/
 [html entities]: https://developer.mozilla.org/en-us/docs/glossary/entity
 [html/template]: https://pkg.go.dev/html/template

content/en/functions/transform/Markdownify.md

@@ -26,6 +26,6 @@ To keep the wrapping `p` tags for a single paragraph, use the [`RenderString`] m
 {{% note %}}
 Although the `markdownify` function honors [markdown render hooks] when rendering markdown to HTML, use the `RenderString` method instead of `markdownify` if a render hook accesses `.Page` context. See issue [#9692] for details.
 
-[markdown render hooks]: /render-hooks
+[markdown render hooks]: /render-hooks/
 [#9692]: https://github.com/gohugoio/hugo/issues/9692
 {{% /note %}}

content/en/functions/transform/Unmarshal.md

@@ -113,7 +113,7 @@ A remote resource is a file on a remote server, accessible via HTTP or HTTPS.
 ```
 
 [resource]: /getting-started/glossary/#resource
-[page bundle]: /content-management/page-bundles
+[page bundle]: /content-management/page-bundles/
 
 ## Options
 
@@ -288,5 +288,5 @@ Hugo renders this to:
 </ul>
 ```
 
-[`index`]: /functions/collections/indexfunction
+[`index`]: /functions/collections/indexfunction/
 [identifiers]: https://go.dev/ref/spec#Identifiers