cmd/explain-pack: Add

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diff --git a/cmd/explain-pack/doc.go b/cmd/explain-pack/doc.go
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+// Command explain-pack reads a Git packfile and writes a
+// human-readable explanation to stdout.
+//
+// With a pack filename argument
+// the pack is mmap'd
+// and a sibling .idx is used when present;
+// with no argument the pack is read from stdin.
+// A packfile does not record its object format,
+// so the format must be given with -format.
+package main