Replace doxygen tag @arg by @param.
Review Request #101596 - Created June 12, 2011 and submitted
The @param doxygen tag is formatted way nicer and should be used throughout our apidox. There are no further changes here. Only @arg -> @param and three fixes where the param name was not stated. The formatting chanes from something like: Defaults to the application wide default font. - font the new font - role which role (usage pattern) to set the font for to: Defaults to the application wide default font. Parameters: <em>font</em> the new font <em>role</em> which role (usage pattern) to set the font for