What version of Go are you using (go version)?

$ go version
go version go1.16.3 windows/amd64

Does this issue reproduce with the latest release?

Yes, including on tip.

What operating system and processor architecture are you using (go env)?

$ go env
set GO111MODULE=on
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\zephyr\AppData\Local\go-build
set GOENV=C:\Users\zephyr\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=E:\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=E:\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=c:\go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=c:\go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.16.3
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=NUL
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\zephyr\AppData\Local\Temp
\go-build1861236026=/tmp/go-build -gno-record-gcc-switches

What did you do?

I explained the explicit argument syntax for printf formatting verbs to someone, then tried to get a useful link to an authoritative source in golang.org/pkg/fmt to explain more thoroughly.

What did you expect to see?

An anchored section on explicit argument indices in the package documentation.

What did you see instead?

A "section" on explicit argument indices, but not one recognized by godoc because the line ends with punctuation:

It seems plausible that this is intentional, as the current structure leaves "Printing" and "Scanning" as the only proper sections. However, not having explicit sections for this particular topic – which seems to be underused – makes it harder to explain and promote its usefulness, particularly because there is no hyperlink to it.

The current document also flows less effectively as a result of these broken sections. There is another subsequent pseudo-section like this on "Format errors:", but also many earlier lines describing the flags for various types; those lines follow this format, but they do not seem to be intended to be distinct subsections. The explicit argument indices section itself is shortly preceded by the line "convert the value before recurring:", which makes it hard to recognize that the former is a distinct section.