go.tools/godoc/redirect: remove redundant redirect rules
go.tools/godoc/redirect: remove redundant redirect rules

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/14365043

webfd/go-zh.tools,8limbs/gotools,bryanxu/go-zh.tools,d0f/go-zh.tools,skyportsystems/go.tools,d0f/go-zh.tools,d0f/go-zh.tools,d0f/go-zh.tools,webfd/go-zh.tools,8limbs/gotools,d0f/go-zh.tools,bryanxu/go-zh.tools,skyportsystems/go.tools,webfd/go-zh.tools,bryanxu/go-zh.tools,bryanxu/go-zh.tools,skyportsystems/go.tools,skyportsystems/go.tools,webfd/go-zh.tools,8limbs/gotools,bryanxu/go-zh.tools,skyportsystems/go.tools,webfd/go-zh.tools