docs(std/testing): fix NewUserRealm reference usage

[MikaelVallenet]

FIX: https://docs.gno.land/reference/stdlibs/std/testing/#testsetrealm

FROM

Usage

addr := std.Address("g1ecely4gjy0yl6s9kt409ll330q9hk2lj9ls3ec")
std.TestSetRealm(std.NewUserRealm(""))
// or 
std.TestSetRealm(std.NewCodeRealm("gno.land/r/demo/users"))

TO

Usage

addr := std.Address("g1ecely4gjy0yl6s9kt409ll330q9hk2lj9ls3ec")
std.TestSetRealm(std.NewUserRealm(addr))
// or 
std.TestSetRealm(std.NewCodeRealm("gno.land/r/demo/users"))

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests

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Codecov Report

All modified and coverable lines are covered by tests ✅

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[leohhhn]

good catch!