cmd/tipgodoc: change capitalization of 'Authors' to be consistent
cmd/tipgodoc: change capitalization of 'Authors' to be consistent

Change-Id: I040007a2b9bfa3388f3fbed839b2e5c6853925b3
Reviewed-on: https://go-review.googlesource.com/13596
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

syreclabs/go-tools,cmars/tools,glasser/golang-tools,cmars/tools,glasser/golang-tools,cw2018/tools,jdhenke/tools,springning/tools,matryer/tools,glasser/golang-tools,springning/tools,argandas/tools,springning/tools,syreclabs/go-tools,glasser/golang-tools,golang/tools,magiccao/tools,jdhenke/tools,argandas/tools,matryer/tools,syreclabs/go-tools,syreclabs/go-tools,syreclabs/go-tools,magiccao/tools,runcom/tools,jdhenke/tools,argandas/tools,cmars/tools,golang/tools,runcom/tools,golang/tools,syreclabs/go-tools,argandas/tools,magiccao/tools,matryer/tools,cw2018/tools,cw2018/tools,cw2018/tools,magiccao/tools,jdhenke/tools,golang/tools,runcom/tools,golang/tools,cmars/tools,matryer/tools,springning/tools,runcom/tools