doc: fix testers.testEqualContents fragment link

[tie]

Description of changes

nixpkgs/pkgs/build-support/testers/default.nix

Lines 22 to 24 in 7e24866

	# See https://nixos.org/manual/nixpkgs/unstable/#tester-testEqualContents
	# or doc/builders/testers.chapter.md
	testEqualContents = {

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[roberth]

I think we should be conservative with changing anchors, but this looks like a good fix nonetheless.

[github-actions]

Successfully created backport PR for release-24.05:

• [Backport release-24.05] doc: fix testers.testEqualContents fragment link #316122

[github-actions]

Git push to origin failed for release-24.05 with exitcode 1