readme: Descriptions for O, b and B
readme: Descriptions for O, b and B

Signed-off-by: Carl Helmertz <d78a787955449ad50f586e5155db5f9260d297a8@gmail.com>

hhsue/vimium,dimatter/vimium,VPashkov/vimium,poacher2k/vimium,philc/vimium,decaffeinate-examples/vimium,csmalin/vimium,smblott-github/vimium-smblott,philc/vimium,PrestanceDesign/vimium,VPashkov/vimium,PickRelated/vimium,Lw-Cui/vimium,Robinson10240/vimium,borgified/vimium,gdh1995/vimium,mrmr1993/vimium,zhangmin510/vimium,douglas-larocca/vimium,csmalin/vimium,Aleroniponi/vimium,poacher2k/vimium,willsALMANJ/vimium,jb55/vimium-plus,Lw-Cui/vimium,cyrixhero/vimium,PickRelated/vimium,jb55/vimium-plus,zhangmin510/vimium,PickRelated/vimium,borgified/vimium,csmalin/vimium,justalittlenoob/vimium,wildeyes/vimium,Aleroniponi/vimium,justalittlenoob/vimium,Lw-Cui/vimium,VPashkov/vimium,gdh1995/vimium,PrestanceDesign/vimium,borgified/vimium,gdh1995/vimium,cyrixhero/vimium,willsALMANJ/vimium,elegantwww/vimium,dimatter/vimium,mrmr1993/vimium,elderbas/vimium,PrestanceDesign/vimium,douglas-larocca/vimium,poacher2k/vimium,cyrixhero/vimium,smblott-github/vimium,crazypenguincode/vimium,hhsue/vimium,wildeyes/vimium,hhsue/vimium,smblott-github/vimium,Robinson10240/vimium,elegantwww/vimium,zhangmin510/vimium,smblott-github/vimium,elderbas/vimium,elderbas/vimium,tuchangwei/vimium,bkudria/vimium,willsALMANJ/vimium,tuchangwei/vimium,decaffeinate-examples/vimium,tuchangwei/vimium,justalittlenoob/vimium,douglas-larocca/vimium,dimatter/vimium,philc/vimium,bkudria/vimium,wildeyes/vimium,decaffeinate-examples/vimium,smblott-github/vimium-smblott,elegantwww/vimium,Robinson10240/vimium,crazypenguincode/vimium,bkudria/vimium,Aleroniponi/vimium,mrmr1993/vimium