blog: tighten stack deformation sentence

Session-ID: ses_39d99b9c2ffeSKxHPZAk9P7E1O

Author: taras

www/blog/2026-02-15-k6-structured-concurrency/index.md

@@ -15,10 +15,10 @@ expect to work with sync `group()` doesn't work once async gets introduced.
 This post is about using structured concurrency to align k6's JavaScript runtime
 with your expectations.
 
-The diagram at the top shows what goes wrong. Async doesn't just add time, it
-deforms your call stack. Some code runs on the stack you are in now, and some
-code runs on a new stack on a future tick. When that happens, the "current" tags
-are different, because `group()` has already unwound and restored them.
+The diagram at the top shows what goes wrong. Async deforms your call stack.
+Some code runs on the stack you are in now, and some code runs on a new stack on
+a future tick. When that happens, the "current" tags are different, because
+`group()` has already unwound and restored them.
 
 ## Why `group()` can't fix this on its own