x/website: use of deprecated math/rand.Seed in the tutorial docs

[RemoteSalad]

What is the URL of the page with the issue?

https://go.dev/doc/tutorial/random-greeting

What is your user agent?

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/110.0

Screenshot

What did you do?

Followed the introductory tutorials

What did you expect to see?

n/a

What did you see instead?

Code examples that produced warnings from the go-staticcheck linter based on #56319 or #54880

rand.Seed has been deprecated since Go 1.20 and an alternative has been available since Go 1.0: Programs that call Seed and then expect a specific sequence of results from the global random source (using functions such as Int) can be broken when a dependency changes how much it consumes from the global random source. To avoid such breakages, programs that need a specific result sequence should use NewRand(NewSource(seed)) to obtain a random generator that other packages cannot access. (SA1019)go-staticcheck

The math/rand module's documentation

[gopherbot]

Change https://go.dev/cl/475275 mentions this issue: _content/doc/tutorial: remove use of deprecated math/rand.Seed