Clarify seq function

content/en/functions/seq.md

@@ -1,6 +1,6 @@
 ---
 title: seq
-description: Creates a sequence of integers.
+description: Returns a slice of integers.
 categories: [functions]
 menu:
   docs:
@@ -10,32 +10,19 @@ signature: ["seq LAST", "seq FIRST LAST", "seq FIRST INCREMENT LAST"]
 relatedfuncs: []
 ---
 
-It's named and used in the model of [GNU's seq].
-
-```
-3 → 1, 2, 3
-1 2 4 → 1, 3
--3 → -1, -2, -3
-1 4 → 1, 2, 3, 4
-1 -2 → 1, 0, -1, -2
+```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]
 ```
 
-## Example: `seq` with `range` and `after`
-
-You can use `seq` in combination with `range` and `after`. The following will return 19 elements:
+Iterate over a sequence of integers:
 
 ```go-html-template
-{{ range after 1 (seq 20) }}
+{{ $product := 1 }}
+{{ range seq 4 }}
+  {{ $product = mul $product . }}
 {{ end }}
+{{ $product }} → 24
 ```
-
-However, when ranging with an index, the following may be less confusing in that `$indexStartingAt1` and `$num` will return `1,2,3 ... 20`:
-
-```go-html-template
-{{ range $index, $num := seq 20 }}
-  {{ $indexStartingAt1 := add $index 1 }}
-{{ end }}
-```
-
-
-[GNU's seq]: https://www.gnu.org/software/coreutils/manual/html_node/seq-invocation.html#seq-invocation