more docs for show-arrow. correct errors

docs/reference/basic.md

@@ -25,6 +25,7 @@ basic.plotLeds(`
 . . . . .
 . . . . .
 `);
+basic.showArrow(ArrowNames.North);
 basic.showAnimation(`
 . . . . .
 . . . . .

docs/reference/basic/show-arrow.md

@@ -0,0 +1,23 @@
+# Show Arrow
+
+Shows the selected arrow on the LED screen
+
+```sig
+basic.showArrow(ArrowNames.North)
+```
+
+### Example
+
+This program shows all eight arrows.
+
+```blocks
+for (let index = 0; index <= 7; index++) {
+    basic.showArrow(index)
+    basic.pause(300)
+}
+```
+
+### See also
+
+[showIcon](/reference/basic/show-icon),
+[showLeds](/reference/basic/show-leds)

docs/reference/basic/show-icon.md

@@ -18,5 +18,4 @@ basic.showIcon(IconNames.Sad)
 
 ### See also
 
-[show leds](/reference/led/show-leds)
-
+[showLeds](/reference/basic/show-leds)

libs/core/icons.ts

@@ -136,6 +136,7 @@ namespace basic {
     //% blockId=basic_show_icon 
     //% block="show icon %i" icon="\uf00a"
     //% parts="ledmatrix"
+    //% help=basic/show-icon
     export function showIcon(icon: IconNames) {
         let res = images.iconImage(icon)
         res.showImage(0)
@@ -146,6 +147,7 @@ namespace basic {
     //% block="show arrow %i=device_arrow"
     //% parts="ledmatrix"
     //% advanced=true
+    //% help=basic/show-arrow
     export function showArrow(i: number) {
         let res = images.arrowImage(i)
         res.showImage(0)