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-pow.md

@@ -8,14 +8,16 @@ layout: manual
 Compute the number to a power.
 
 ```kcl
-pow(
-  @input: number,
-  exp: number(_),
-): number
+exampleSketch = startSketchOn(XZ)
+  |> startProfile(at = [0, 0])
+  |> angledLine(angle = 50deg, length = pow(5, exp = 2))
+  |> yLine(endAbsolute = 0)
+  |> close()
+
+example = extrude(exampleSketch, length = 5)
+
 ```
 
-
-
 ### Arguments
 
 | Name | Type | Description | Required |
@@ -28,6 +30,15 @@ pow(
 [`number`](/docs/kcl-std/types/std-types-number) - A number.
 
 
+### Function signature
+
+```kcl
+pow(
+  @input: number,
+  exp: number(_),
+): number
+```
+
 ### Examples
 
 ```kcl