_content/doc/go1.26: add note for lower go mod init go directive version

Change-Id: I4518c037238cd6316320e78381da76016a6a6964
Reviewed-on: https://go-review.googlesource.com/c/website/+/731720
Reviewed-by: Michael Matloob <matloob@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Michael Matloob <matloob@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

_content/doc/go1.26.md

diff --git a/_content/doc/go1.26.md b/_content/doc/go1.26.md
index 39a220c..7361ef7 100644
--- a/_content/doc/go1.26.md
+++ b/_content/doc/go1.26.md
@@ -49,6 +49,17 @@
 
 ### Go command {#go-command}
 
+<!-- go.dev/issue/74748 -->
+`go mod init` now defaults to a lower `go` version in new `go.mod` files. `go mod init`
+using a toolchain of version `1.N.X` will create a `go.mod` file
+specifying the Go version `go 1.(N-1).0`. Pre-release versions of `1.N` will
+create `go.mod` files specifying `go 1.(N-2).0`. In practice, this means Go 1.26
+release candidates will create `go.mod` files with `go 1.24.0`, and Go 1.26
+and its minor releases will create `go.mod` files with `go 1.25.0`. This is intended
+to encourage the creation of modules that are compatible with currently supported
+versions of Go. For additional control over the `go` version in new modules,
+`go mod init` can be followed up with `go get go@version`.
+
 <!-- go.dev/issue/74667 -->
 `cmd/doc`, and `go tool doc` have been deleted. `go doc` can be used as
 a replacement for `go tool doc`: it takes the same flags and arguments and