design/14951: fix minor typo

Change-Id: I40c99e135f665ecce3e5c5d122ffb2b8696acd5b
Reviewed-on: https://go-review.googlesource.com/123035
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/design/14951-soft-heap-limit.md b/design/14951-soft-heap-limit.md
index 10f0c20..a3f82f8 100644
--- a/design/14951-soft-heap-limit.md
+++ b/design/14951-soft-heap-limit.md
@@ -173,7 +173,7 @@
 
 Interestingly, while most of the variance in the original design was
 around GC CPU usage, that variance has been traded to the heap ratio
-in this new design[o][p].
+in this new design.
 This is because the scheduler *does not allow* GC CPU usage to drop
 below 25%.
 Hence, the controller saturates and the inherent variance shifts to