fuzz: remove misleading block fuzzer comment
fuzz: remove misleading block fuzzer comment

This looks like it's copied from the qcow fuzzer, and it doesn't apply
to the block fuzzer.  The actual behavior of the block fuzzer is
correctly described by the comment later in the file.

BUG=None
TEST=`USE='asan fuzzer' emerge-nami crosvm`

Change-Id: I9ccd6deba44af8b8df471ee0078ace385696151f
Signed-off-by: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1853698
Reviewed-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

google/crosvm,google/crosvm,google/crosvm,google/crosvm