x/tools/gopls: document Change Signature refactoring (rename on func token) #76343
Description
What version of Go are you using (go version)?
$ go version go version go1.25.4 darwin/arm64 $ gopls version golang.org/x/tools/gopls v0.20.0
Does this issue reproduce with the latest release?
What operating system and processor architecture are you using (go env)?
go env Output
$ go env AR='ar' CC='cc' CGO_CFLAGS='-O2 -g' CGO_CPPFLAGS='' CGO_CXXFLAGS='-O2 -g' CGO_ENABLED='1' CGO_FFLAGS='-O2 -g' CGO_LDFLAGS='-O2 -g' CXX='c++' GCCGO='gccgo' GO111MODULE='on' GOARCH='arm64' GOARM64='v8.0' GOAUTH='netrc' GOBIN='' GOCACHE='/Users/ilyasyoy/Library/Caches/go-build' GOCACHEPROG='' GODEBUG='' GOENV='/Users/ilyasyoy/Library/Application Support/go/env' GOEXE='' GOEXPERIMENT='' GOFIPS140='off' GOFLAGS='' GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/f2/s841xw414zqfscfkvn76cfv40000gn/T/go-build258738511=/tmp/go-build -gno-record-gcc-switches -fno-common' GOHOSTARCH='arm64' GOHOSTOS='darwin' GOINSECURE='' GOMOD='/Users/ilyasyoy/Projects/IlyasYOY/golangci-lint/go.mod' GOMODCACHE='/Users/ilyasyoy/go/pkg/mod' GONOPROXY='' GONOSUMDB='' GOOS='darwin' GOPATH='/Users/ilyasyoy/go' GOPRIVATE='' GOPROXY='direct' GOROOT='/opt/homebrew/Cellar/go/1.25.4/libexec' GOSUMDB='off' GOTELEMETRY='local' GOTELEMETRYDIR='/Users/ilyasyoy/Library/Application Support/go/telemetry' GOTMPDIR='' GOTOOLCHAIN='auto' GOTOOLDIR='/opt/homebrew/Cellar/go/1.25.4/libexec/pkg/tool/darwin_arm64' GOVCS='' GOVERSION='go1.25.4' GOWORK='' PKG_CONFIG='pkg-config' uname -v: Darwin Kernel Version 25.1.0: Mon Oct 20 19:34:03 PDT 2025; root:xnu-12377.41.6~2/RELEASE_ARM64_T8112 ProductName: macOS ProductVersion: 26.1 BuildVersion: 25B78 lldb --version: lldb-1703.0.31.2 Apple Swift version 6.2 (swiftlang-6.2.0.19.9 clang-1700.3.19.1)
What did you do?
I put a cursor on the function and call rename, after that I get:
The name filled with the wrong data: func() commands.BuildInfo. Everything is fine when I put the cursor exactly on the name of the function: 
The problem is happens in neovim (I simply checked that VSCode contains it, it did): 
What did you expect to see?
I expect to see the name of the function and replace to work as if I put the cursor on the name of the function.
What did you see instead?
When I press enter I get: 