godoc: minor internal fix
godoc: minor internal fix

The value of the internal flag includeNonGoFile
really is the value of the fulltextIndex flag.

R=rsc
CC=golang-dev
http://codereview.appspot.com/4044052

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