Standardize on no space before ':' in the text.  Use tbp instead of h
for the Message table float placement, and correct a typo in the type
coercion section.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@837 edb9625f-4e0d-4859-8d74-9fd3b1da38cb