Doc gives wrong syntax for changing agent file

```
Docs have the following:
  -agentpath:path/to/liblagent.so[:file=fname]

Should be: 
  -agentpath:path/to/liblagent.so[=file=fname]
```

Original issue reported on code.google.com by `dcapw...@pivotal.io` on 18 Oct 2014 at 5:54
