man: Reading documentation from the top

man allows the user to read the documentation of a command from the beggining of it.

man is basically a wrapper around the help command. It allows the user to start reading the documentation from the beginning of it and move down using any key.
Things to consider:
- takes the command as a string.
- use 'q' to exit help
- use <space> to move down half a page

Example:
man('help') % show the documentation of the help command
man('repmat') % show the documentation of the repmat command