godoc: identifiers can contain underscores, not spaces. Fixes golang/go#7382.
godoc: identifiers can contain underscores, not spaces.
Fixes golang/go#7382.

R=bradfitz, sameer
CC=golang-codereviews
https://golang.org/cl/67090043

josharian/tools,golang/tools,cw2018/tools,jdhenke/tools,magiccao/tools,cmars/tools,golang/tools,springning/tools,cmars/tools,magiccao/tools,nicot/tools,cmars/tools,sshetty10/tools,runcom/tools,golang/tools,matryer/tools,nicot/tools,golang/tools,argandas/tools,glasser/golang-tools,sshetty10/tools,syreclabs/go-tools,argandas/tools,glasser/golang-tools,syreclabs/go-tools,nicot/tools,runcom/tools,dmitris/tools,syreclabs/go-tools,maddyonline/tools,josharian/tools,glasser/golang-tools,josharian/tools,syreclabs/go-tools,cw2018/tools,syreclabs/go-tools,syreclabs/go-tools,matryer/tools,cw2018/tools,magiccao/tools,runcom/tools,sshetty10/tools,matryer/tools,springning/tools,cw2018/tools,matryer/tools,4ad/tools,maddyonline/tools,magiccao/tools,jdhenke/tools,cmars/tools,maddyonline/tools,4ad/tools,argandas/tools,runcom/tools,maddyonline/tools,golang/tools,jdhenke/tools,springning/tools,nicot/tools,argandas/tools,dmitris/tools,sshetty10/tools,jdhenke/tools,4ad/tools,josharian/tools,dmitris/tools,dmitris/tools,glasser/golang-tools,springning/tools