Repair an incomprehensible comment.
diff --git a/Objects/obmalloc.c b/Objects/obmalloc.c
index b576123..435c4b6 100644
--- a/Objects/obmalloc.c
+++ b/Objects/obmalloc.c
@@ -326,8 +326,8 @@
from the pool_header to the start of "the next" virgin block is stored in
the pool_header nextoffset member, and the largest value of nextoffset that
makes sense is stored in the maxnextoffset member when a pool is initialized.
-All the blocks in a pool have been passed out at least when and only when
-nextoffset > maxnextoffset.
+All the blocks in a pool have been passed out at least once when and only
+when nextoffset > maxnextoffset.
Major obscurity: While the usedpools vector is declared to have poolp