Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

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

Closes #11925

docs/content/en/functions/images/Saturation.md

@@ -0,0 +1,36 @@
+---
+title: images.Saturation
+description: Returns an image filter that changes the saturation of an image.
+categories: []
+keywords: []
+action:
+  aliases: []
+  related:
+    - functions/images/Filter
+    - methods/resource/Filter
+  returnType: images.filter
+  signatures: [images.Saturation PERCENTAGE]
+toc: true
+---
+
+The percentage must be in the range [-100, 500] where 0 has no effect.
+
+## Usage
+
+Create the filter:
+
+```go-html-template
+{{ $filter := images.Saturation 65 }}
+```
+
+{{% include "functions/images/_common/apply-image-filter.md" %}}
+
+## Example
+
+{{< img
+  src="images/examples/zion-national-park.jpg"
+  alt="Zion National Park"
+  filter="Saturation"
+  filterArgs="65"
+  example=true
+>}}