doc/next: initialize

Initialize the doc/next directory for the next release by copying the
contents of doc/initial into it.

For #73829.

Change-Id: Ia473d0430043920fc5135844ec6c117eb1b00217
Reviewed-on: https://go-review.googlesource.com/c/go/+/689878
Reviewed-by: Mark Freeman <mark@golang.org>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

doc/next/1-intro.md

@@ -0,0 +1,8 @@
+<style>
+  main ul li { margin: 0.5em 0; }
+</style>
+
+## DRAFT RELEASE NOTES — Introduction to Go 1.26 {#introduction}
+
+**Go 1.26 is not yet released. These are work-in-progress release notes.
+Go 1.26 is expected to be released in February 2026.**

doc/next/2-language.md

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+## Changes to the language {#language}
+
+

doc/next/3-tools.md

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+## Tools {#tools}
+
+### Go command {#go-command}
+
+### Cgo {#cgo}
+

doc/next/4-runtime.md

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+## Runtime {#runtime}

doc/next/5-toolchain.md

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+## Compiler {#compiler}
+
+## Assembler {#assembler}
+
+## Linker {#linker}
+
+

doc/next/6-stdlib/0-heading.md

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+## Standard library {#library}
+

doc/next/6-stdlib/99-minor/0-heading.md

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+### Minor changes to the library {#minor_library_changes}
+
+#### go/types
+
+The `Var.Kind` method returns an enumeration of type `VarKind` that
+classifies the variable (package-level, local, receiver, parameter,
+result, or struct field). See issue #70250.
+
+Callers of `NewVar` or `NewParam` are encouraged to call `Var.SetKind`
+to ensure that this attribute is set correctly in all cases.

doc/next/6-stdlib/99-minor/README

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+API changes and other small changes to the standard library go here.

doc/next/7-ports.md

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+## Ports {#ports}
+