tmpl: correct println description

> Spaces are always added between operands and a newline is appended.
`println` *always* inserts spaces within arguments, as defined in the
godoc: https://pkg.go.dev/fmt#Sprintln

Signed-off-by: Galen CC <[email protected]>

content/docs/reference/templates/functions.md

@@ -1722,7 +1722,7 @@ Concatenates the arguments in order, adding spaces between arguments when neithe
 {{ $result := println <args...> }}
 ```
 
-Concatenates the arguments in order, adding spaces between arguments when neither is a string and inserting a newline at
+Concatenates the arguments in order, adding spaces between arguments and inserting a newline at
 the end.
 
 #### printf