path: Documentation regarding `/` support

[itsjamie]

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

go version go1.7 windows/amd64

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

set GOARCH=amd64
set GOBIN=C:\Users\tjenkins\go-dev\bin
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=C:\Users\tjenkins\go-dev
set GORACE=
set GOROOT=C:\Go
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set CC=gcc
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\tjenkins\AppData\Local\Temp\go-build759658326=/tmp/go-build -gno-record-gcc-switches
set CXX=g++
set CGO_ENABLED=1

What did you do?

Creating files on the system and later retrieving them via filepath.Glob. Code further downstream took the returned paths and utilized path.Base to find the base portion, this failed due to the \ vs / difference.

What did you expect to see

Would prefer if the package documentation for path make explicit mention of the lack of support for systems that are not / separated, directing the user to sub package filepath. It mentions slash-separated, which was taken to mean / or \.

Thanks!

[gopherbot]

CL https://golang.org/cl/32423 mentions this issue.