Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

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

Closes #11925

docs/content/en/functions/collections/Seq.md

@@ -0,0 +1,36 @@
+---
+title: collections.Seq
+description: Returns a slice of integers.
+categories: []
+keywords: []
+action:
+  aliases: [seq]
+  related: []
+  returnType: '[]int'
+  signatures:
+    - collections.Seq LAST
+    - collections.Seq FIRST LAST
+    - collections.Seq FIRST INCREMENT LAST
+aliases: [/functions/seq]
+---
+
+```go-html-template
+{{ seq 2 }} → [1 2]
+{{ seq 0 2 }} → [0 1 2]
+{{ seq -2 2 }} → [-2 -1 0 1 2]
+{{ seq -2 2 2 }} → [-2 0 2]
+```
+
+A contrived example of iterating over a sequence of integers:
+
+```go-html-template
+{{ $product := 1 }}
+{{ range seq 4 }}
+  {{ $product = mul $product . }}
+{{ end }}
+{{ $product }} → 24
+```
+
+{{% note %}}
+The slice created by the `seq` function is limited to 2000 elements.
+{{% /note %}}