Document keyVals function

content/en/functions/keyvals.md

@@ -0,0 +1,44 @@
+---
+title: keyVals
+description: Returns a KeyVals struct.
+categories: [functions]
+menu:
+  docs:
+    parent: functions
+keywords: []
+namespace: collections
+relatedFuncs: []
+signature:
+ - collections.KeyVals KEY VALUES...
+ - keyVals KEY VALUES...
+
+---
+
+The primary application for this function is the definition of the `namedSlices` parameter in the options map passed to the `.Related` method on the `Page` object.
+
+See [related content](/content-management/related).
+
+```go-html-template
+{{ $kv := keyVals "foo" "a" "b" "c" }}
+```
+
+The resulting data structure is:
+
+```json
+{
+  "Key": "foo",
+  "Values": [
+    "a",
+    "b",
+    "c"
+  ]
+}
+```
+
+To extract the key and values:
+
+```go-html-template
+
+{{ $kv.Key }} → foo
+{{ $kv.Values }} → [a b c]
+```