Fix typo in CHANGELOG.md

The word 'know' is missing from 'If you the expression' in CHANGELOG.md.

Closes #36676
https://github.com/dart-lang/sdk/pull/36676

GitOrigin-RevId: e406ea211f0421f5208d728e0d6261d12782adcc
Change-Id: Ifa335b2858f978837955eca23f47de589934b007
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99881
Reviewed-by: Kevin Moore <kevmoo@google.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4b5979a..313f4bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,7 +41,7 @@
 );
 ```
 
-If you the expression might evaluate to null and you want to treat that as
+If you know the expression might evaluate to null and you want to treat that as
 equivalent to zero elements, you can use the null-aware spread `?...`.
 
 #### Collection if