Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

```
git subtree add --prefix=docs/ https://github.com/gohugoio/hugoDocs.git master --squash
```

Closes #11925

docs/content/en/methods/pages/GroupBy.md

@@ -0,0 +1,36 @@
+---
+title: GroupBy
+description: Returns the given page collection grouped by the given field in ascending order.
+categories: []
+keywords: []
+action:
+  related: []
+  returnType: page.PagesGroup
+  signatures: ['PAGES.GroupBy FIELD [SORT]']
+---
+
+{{% include "methods/pages/_common/group-sort-order.md" %}}
+
+```go-html-template
+{{ range .Pages.GroupBy "Section" }}
+  <p>{{ .Key }}</p>
+  <ul>
+    {{ range .Pages }}
+      <li><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></li>
+    {{ end }}
+  </ul>
+{{ end }}
+```
+
+To sort the groups in descending order:
+
+```go-html-template
+{{ range .Pages.GroupBy "Section" "desc" }}
+  <p>{{ .Key }}</p>
+  <ul>
+    {{ range .Pages }}
+      <li><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></li>
+    {{ end }}
+  </ul>
+{{ end }}
+```