Replace all occurrences of 'when' with 'if' in documentation and tutorial.

Also update the naturaldocs keywords file.

Closes #1396

1 files changed, 1 insertions, 1 deletions

diff --git a/doc/tutorial/control.md b/doc/tutorial/control.md
index 966aeb2df52..fc89218b751 100644
--- a/doc/tutorial/control.md
+++ b/doc/tutorial/control.md
@@ -67,7 +67,7 @@ that `(float, float)` is a tuple of two floats:
 
     fn angle(vec: (float, float)) -> float {
         alt vec {
-          (0f, y) when y < 0f { 1.5 * std::math::pi }
+          (0f, y) if y < 0f { 1.5 * std::math::pi }
           (0f, y) { 0.5 * std::math::pi }
           (x, y) { std::math::atan(y / x) }
         }