*: reflow comments to 80 characters

This reformats the entire Metropolis codebase to have comments no longer
than 80 characters, implementing CR/66.

This has been done half manually, as we don't have a good integration
between commentwrap/Bazel, but that can be implemented if we decide to
go for this tool/limit.

Change-Id: If1fff0b093ef806f5dc00551c11506e8290379d0
diff --git a/metropolis/pkg/fsquota/fsinfo.go b/metropolis/pkg/fsquota/fsinfo.go
index f885d51..ecbaecf 100644
--- a/metropolis/pkg/fsquota/fsinfo.go
+++ b/metropolis/pkg/fsquota/fsinfo.go
@@ -24,9 +24,9 @@
 	"golang.org/x/sys/unix"
 )
 
-// This requires fsinfo() support, which is not yet in any stable kernel.
-// Our kernel has that syscall backported. This would otherwise be an extremely expensive
-// operation and also involve lots of logic from our side.
+// This requires fsinfo() support, which is not yet in any stable kernel. Our
+// kernel has that syscall backported. This would otherwise be an extremely
+// expensive operation and also involve lots of logic from our side.
 
 // From syscall_64.tbl
 const sys_fsinfo = 441