Update documentation around time.Sleep to specify its precision, and suggest a possible interface for more granular sleep times.
Update documentation around time.Sleep to specify its precision, and suggest
a possible interface for more granular sleep times.

Fixes issue #260.

R=rsc, r
CC=golang-dev
http://codereview.appspot.com/181058

Committer: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

mhennings/marcohennings-go,sanjosh/sanjos100-tipc,npe9/noahevans-go9,rdp/rogerpack2005-golang,scirelli/scirelli-go,bryanxu/go-zh,webfd/go-zh,glycerine/jeaten-go-arrayof-structof,rdp/rogerpack2005-golang,glycerine/jeaten-go-arrayof-structof,scirelli/scirelli-go,npe9/noahevans-go9,scirelli/scirelli-go,mhennings/marcohennings-go,sanjosh/sanjos100-tipc,sanjosh/sanjos100-tipc,bryanxu/go-zh,mhennings/marcohennings-go,npe9/noahevans-go9,webfd/go-zh,bryanxu/go-zh,d0f/go-zh,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,Triskite/willstone-goclone,webfd/go-zh,Triskite/willstone-goclone,Triskite/willstone-goclone,Triskite/willstone-goclone,d0f/go-zh,npe9/noahevans-go9,rdp/rogerpack2005-golang,rdp/rogerpack2005-golang,scirelli/scirelli-go,rdp/rogerpack2005-golang,Triskite/willstone-goclone,scirelli/scirelli-go,scirelli/scirelli-go,scirelli/scirelli-go,d0f/go-zh,mhennings/marcohennings-go,rflanagan/reginaldflanagan-project1,d0f/go-zh,rflanagan/reginaldflanagan-project1,bryanxu/go-zh,sanjosh/sanjos100-tipc,npe9/noahevans-go9,sanjosh/sanjos100-tipc,glycerine/jeaten-go-arrayof-structof,webfd/go-zh,Triskite/willstone-goclone,rflanagan/reginaldflanagan-project1,webfd/go-zh,glycerine/jeaten-go-arrayof-structof,glycerine/jeaten-go-arrayof-structof,rflanagan/reginaldflanagan-project1,bryanxu/go-zh,npe9/noahevans-go9,d0f/go-zh,Triskite/willstone-goclone,d0f/go-zh,glycerine/jeaten-go-arrayof-structof,glycerine/jeaten-go-arrayof-structof,rdp/rogerpack2005-golang,webfd/go-zh,bryanxu/go-zh,npe9/noahevans-go9,sanjosh/sanjos100-tipc,bryanxu/go-zh,d0f/go-zh,mhennings/marcohennings-go,rdp/rogerpack2005-golang,rdp/rogerpack2005-golang,d0f/go-zh,rflanagan/reginaldflanagan-project1,webfd/go-zh,npe9/noahevans-go9,rflanagan/reginaldflanagan-project1,sanjosh/sanjos100-tipc,webfd/go-zh,scirelli/scirelli-go,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,bryanxu/go-zh,glycerine/jeaten-go-arrayof-structof,Triskite/willstone-goclone