cmd/godoc: add missing space to flag description
cmd/godoc: add missing space to flag description

Change-Id: I8f4dada13353065475baf33c71e6e1a28f889e71
Reviewed-on: https://go-review.googlesource.com/1892
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

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