Correct some spellings.

Test: mma
Change-Id: Icc49a4ee76f12d302ed18982d334f2f70b7263a8
diff --git a/update_metadata.proto b/update_metadata.proto
index 7ff032a..fe81efb 100644
--- a/update_metadata.proto
+++ b/update_metadata.proto
@@ -82,7 +82,7 @@
 //   the new partition.
 //
 // The operations allowed in the payload (supported by the client) depend on the
-// major and minor version. See InstallOperation.Type bellow for details.
+// major and minor version. See InstallOperation.Type below for details.
 
 syntax = "proto2";