s/protocol buffers/Protocol Buffers/


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@911 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
* vignettes/RProtoBuf-intro.Rnw: Applied a few corrections spotted by
Tim Hesterberg and communicated in email.


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@912 edb9625f-4e0d-4859-8d74-9fd3b1da38cb