run go fmt to make CI happy

wal/00walconst.go

@@ -1,19 +1,20 @@
-//  wal implements write-ahead logging
+// wal implements write-ahead logging
 //
-//  The layout of log:
-//  [ installed writes | logged writes | in-memory/logged | unstable in-memory ]
-//   ^                   ^               ^                  ^
-//   0                   memStart        diskEnd            nextDiskEnd
+// The layout of log:
+// [ installed writes | logged writes | in-memory/logged | unstable in-memory ]
 //
-//  Blocks in the range [diskEnd, nextDiskEnd) are in the process of
-//  being logged.  Blocks in unstable are unstably committed (i.e.,
-//  written by NFS Write with the unstable flag and they can be lost
-//  on crash). Later transactions may absorb them (e.g., a later NFS
-//  write may update the same inode or indirect block).  The code
-//  implements a policy of postponing writing unstable blocks to disk
-//  as long as possible to maximize the chance of absorption (i.e.,
-//  commitWait or log is full).  It may better to start logging
-//  earlier.
+// ^                  ^               ^                  ^
+// 0                  memStart        diskEnd            nextDiskEnd
+//
+// Blocks in the range [diskEnd, nextDiskEnd) are in the process of
+// being logged.  Blocks in unstable are unstably committed (i.e.,
+// written by NFS Write with the unstable flag and they can be lost
+// on crash). Later transactions may absorb them (e.g., a later NFS
+// write may update the same inode or indirect block).  The code
+// implements a policy of postponing writing unstable blocks to disk
+// as long as possible to maximize the chance of absorption (i.e.,
+// commitWait or log is full).  It may better to start logging
+// earlier.
 package wal
 
 import (