Various nits

- s/apending/appending/
- s/false (0)/false(0)/
- s/ForwardingOption/ForwardingOptions/
- s/ICE ,/ICE,/
- s/bootstrap-peer/bootstrap-node/
- s/relax NG/RELAX NG/
Merge pull request #164 from petithug/various-nits

Various nits