Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

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

Closes #11925

docs/content/en/functions/math/Sum.md

@@ -0,0 +1,21 @@
+---
+title: math.Sum
+description: Returns the sum of all numbers. Accepts scalars, slices, or both.
+categories: []
+action:
+  aliases: []
+  related:
+    - functions/math/Add
+    - functions/math/Div
+    - functions/math/Mul
+    - functions/math/Product
+    - functions/math/Sub
+  returnType: float64
+  signatures: [math.Sum VALUE...]
+---
+
+{{< new-in 0.114.0 >}}
+
+```go-html-template
+{{ math.Sum 1 (slice 2 3) 4 }} → 10
+```