Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

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

Closes #11925

docs/content/en/methods/shortcode/RelRef.md

@@ -0,0 +1,44 @@
+---
+title: RelRef
+description: Returns the relative URL of the page with the given path, language, and output format.
+categories: []
+keywords: []
+action:
+  related:
+    - methods/shortcode/Ref
+    - functions/urls/Ref
+    - functions/urls/RelRef
+  returnType: string
+  signatures: [SHORTCODE.RelRef OPTIONS]
+---
+
+The map of option contains:
+
+path
+: (`string`) The path to the page, relative to the content directory. Required.
+
+lang
+: (`string`) The language (site) to search for the page. Default is the current language. Optional.
+
+outputFormat
+: (`string`) The output format to search for the page. Default is the current output format. Optional.
+
+The examples below show the rendered output when visiting a page on the English language version of the site:
+
+```go-html-template
+{{ $opts := dict "path" "/books/book-1" }}
+{{ .RelRef $opts }} → /en/books/book-1/
+
+{{ $opts := dict "path" "/books/book-1" "lang" "de" }}
+{{ .RelRef $opts }} → /de/books/book-1/
+
+{{ $opts := dict "path" "/books/book-1" "lang" "de" "outputFormat" "json" }}
+{{ .RelRef $opts }} → /de/books/book-1/index.json
+```
+
+By default, Hugo will throw an error and fail the build if it cannot resolve the path. You can change this to a warning in your site configuration, and specify a URL to return when the path cannot be resolved.
+
+{{< code-toggle file=hugo >}}
+refLinksErrorLevel = 'warning'
+refLinksNotFoundURL = '/some/other/url'
+{{< /code-toggle >}}