Make the function signature less prominent, add an early example to docs

Signed-off-by: Nick Cameron <nrc@ncameron.org>

docs/kcl-std/functions/std-math-legAngX.md

@@ -8,14 +8,10 @@ layout: manual
 Compute the angle of the given leg for x.
 
 ```kcl
-legAngX(
-  hypotenuse: number(Length),
-  leg: number(Length),
-): number(deg)
+legAngX(hypotenuse = 5, leg = 3)
+
 ```
 
-
-
 ### Arguments
 
 | Name | Type | Description | Required |
@@ -28,6 +24,15 @@ legAngX(
 [`number(deg)`](/docs/kcl-std/types/std-types-number) - A number.
 
 
+### Function signature
+
+```kcl
+legAngX(
+  hypotenuse: number(Length),
+  leg: number(Length),
+): number(deg)
+```
+
 ### Examples
 
 ```kcl