all.sh: fix a typo in comment

Signed-off-by: Yanray Wang <yanray.wang@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 9290aa6..baa2b60 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -864,7 +864,7 @@
 #        Example:
 #          loc_extra_list="ALG_SHA_224 ALG_SHA_256 ALG_SHA_384 ALG_SHA_512"
 #          helper_libtestdriver1_make_drivers "$loc_accel_list" "$loc_extra_list"
-#    4b. Call helper_libtestdriver1_make_main "$loc_accel_list". Any
+#    3b. Call helper_libtestdriver1_make_main "$loc_accel_list". Any
 #        additional arguments will be passed to make: this can be useful if
 #        you don't want to build everything when iterating during development.
 #        Example: