*: 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/build/fietsje/deps_gvisor.go b/build/fietsje/deps_gvisor.go
index 3209aa4..3414e4c 100644
--- a/build/fietsje/deps_gvisor.go
+++ b/build/fietsje/deps_gvisor.go
@@ -32,6 +32,7 @@
 		"github.com/mohae/deepcopy",
 		"golang.org/x/time",
 	)
-	// gRPC is used by gvisor's bazel machinery, but not present in go.sum. Include it manually.
+	// gRPC is used by gvisor's bazel machinery, but not present in go.sum. Include it
+	// manually.
 	p.collect("github.com/grpc/grpc", "v1.29.1")
 }