update doc for knit()
update doc for knit()

antass/labnotebook3,fboehm/labnotebook,fboehm/labnotebook,antass/labnotebook3,fboehm/labnotebook,antass/labnotebook3,fboehm/labnotebook,fboehm/cboettig_site,fboehm/cboettig_site,fboehm/cboettig_site,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/cboettig_site