internal/fetch/dochtml: fix whitespace in template
internal/fetch/dochtml: fix whitespace in template

Change-Id: Ibe62bf5c28db24cf7c82b74445d08cc67beda87c
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/255459
Trust: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
Run-TryBot: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
Reviewed-by: Jamal Carvalho <e0195770807aa8c82b0b128d9c0423b5ad035172@golang.org>
TryBot-Result: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

golang/pkgsite,golang/pkgsite,golang/pkgsite,golang/pkgsite