docs(2/pin)

ipfs1 docs read:

```
btc λ. ipfs pin
ipfs pin -

Commands:

        add         pin an ipfs object to local storage.
        rm          unpin an ipfs object from local storage.

        Use "pin help <command>" for more information about a command.
```

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

core/commands2/pin.go

@@ -11,7 +11,7 @@ import (
 
 var pinCmd = &cmds.Command{
 	Helptext: cmds.HelpText{
-		Tagline: "Keeps objects stored locally",
+		Tagline: "Pin (and unpin) objects to local storage",
 	},
 
 	Subcommands: map[string]*cmds.Command{