Fix comment

Co-authored-by: sagudev <16504129+sagudev@users.noreply.github.com>

sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs

diff --git a/sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs b/sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs
index 397186e..c5f7a2d 100644
--- a/sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs
+++ b/sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs
@@ -236,7 +236,7 @@
         // we will end up with around ~2000 regions). We therefore aim to choose a granularity such
         // that no more than 50 (more or less arbitrarily chosen) chunks need to be processed
         // by a single thread. However, we also don't want to put too many regions in a
-        // single group (the currently chosen values i 8) to prevent stalls in case some of the
+        // single group (the currently chosen values is 8) to prevent stalls in case some of the
         // later regions contain more work than the previous ones.
         let granularity = {
             const CHUNKS_PER_THREAD: u32 = 50;