text/template: fix the documentation of the block action
text/template: fix the documentation of the block action

Fixes #23520

Change-Id: Ia834819f3260691a1a0181034ef4b4b945965688
Reviewed-on: https://go-review.googlesource.com/94761
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

cloudflare/go,akutz/go,CAFxX/go,nawawi/go,golang/go,codestation/go,akutz/go,josharian/go,golang/go,Cofyc/go,akutz/go,golang/go,golang/go,akutz/go,nawawi/go,golang/go,josharian/go,josharian/go,Cofyc/go,CAFxX/go,codestation/go,akutz/go,nawawi/go,nawawi/go,cloudflare/go,nawawi/go,cloudflare/go,codestation/go,Cofyc/go,josharian/go,CAFxX/go,codestation/go,golang/go,akutz/go,josharian/go,Cofyc/go,codestation/go,CAFxX/go,Cofyc/go,akutz/go,Cofyc/go,nawawi/go,cloudflare/go,akutz/go,golang/go,nawawi/go,codestation/go,CAFxX/go,cloudflare/go,josharian/go,codestation/go,CAFxX/go,cloudflare/go,josharian/go,Cofyc/go,cloudflare/go,cloudflare/go,CAFxX/go,codestation/go,golang/go,Cofyc/go,nawawi/go,CAFxX/go,josharian/go