Fix bad links in docs code blocks (#6649)

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

docs/kcl-src/modules.md

@@ -12,7 +12,7 @@ to other modules.
 
 ```kcl
 // util.kcl
-export fn increment(x) {
+export fn increment(@x) {
   return x + 1
 }
 ```
@@ -37,11 +37,11 @@ Multiple functions can be exported in a file.
 
 ```kcl
 // util.kcl
-export fn increment(x) {
+export fn increment(@x) {
   return x + 1
 }
 
-export fn decrement(x) {
+export fn decrement(@x) {
   return x - 1
 }
 ```
@@ -81,7 +81,7 @@ fn cube(center) {
     |> extrude(length = 10)
 }
 
-myCube = cube([0, 0])
+myCube = cube(center = [0, 0])
 ```
 
 *Pros*

docs/kcl-src/types.md

@@ -249,8 +249,8 @@ fn rect(origin) {
     |> close()
 }
 
-rect([0, 0])
-rect([20, 0])
+rect(origin = [0, 0])
+rect(origin = [20, 0])
 ``` 
 
 Those tags would only be available in the `rect` function and not globally.
@@ -279,8 +279,8 @@ fn rect(origin) {
     |> close()
 }
 
-rect([0, 0])
-myRect = rect([20, 0])
+rect(origin = [0, 0])
+myRect = rect(origin = [20, 0])
 
 myRect
   |> extrude(length = 10)