docs: backport layouts updates from the main branch

site/layouts/shortcodes/param.html

@@ -1,11 +1,13 @@
 {{- /*
   Work around wrong escapes in integrity attributes.
+  Original: https://github.com/gohugoio/hugo/blob/master/tpl/tplimpl/embedded/templates/shortcodes/param.html
 */ -}}
 
 {{- $name := .Get 0 -}}
 {{- with $name -}}
 {{- $value := $.Page.Param . -}}
-{{- if in $name "_hash" -}}
+{{- /* If any parameter ends with `_hash`, mark the string as safe HTML */ -}}
+{{- if (strings.HasSuffix $name "_hash") -}}
   {{- $value = $value | safeHTML -}}
 {{- end -}}
 {{- with $value }}{{ . }}{{ else }}{{ errorf "Param %q not found: %s" $name $.Position }}{{ end -}}