Encapsulate superclass method link rendering

[st0012]

Problem

While reviewing #1571, I noticed a small follow-up refactoring opportunity in the superclass-method notice rendered by the HTML templates.

Both Aliki and Darkfish were reaching through method.formatter directly to build the superclass method link. That leaves template code responsible for formatter details and makes the escaping boundary less explicit.

Solution

• Add RDoc::AnyMethod#superclass_method_link as the generator-facing helper for rendering the superclass method link.
• Escape the visible link text inside that helper while preserving the raw method name for cross-reference lookup.
• Update the Aliki and Darkfish templates to call the new helper instead of constructing formatter links directly.
• Cover the helper behavior with a generator markup unit test, including operator method names such as <<.

[Copilot]

Pull request overview

This PR refactors how the HTML generators render the “Calls superclass method …” link by moving link construction into a generator-facing helper on RDoc::AnyMethod, making escaping behavior explicit and keeping formatter details out of templates.

Changes:

• Add RDoc::AnyMethod#superclass_method_link to encapsulate superclass-method link rendering (including escaping of visible text).
• Update Aliki and Darkfish class templates to call superclass_method_link instead of reaching into method.formatter.
• Add generator markup tests covering normal and operator (<<) method names.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
test/rdoc/generator/markup_test.rb	Adds unit tests for superclass_method_link, including operator-name escaping.
lib/rdoc/generator/template/darkfish/class.rhtml	Switches superclass-method notice rendering to the new helper.
lib/rdoc/generator/template/aliki/class.rhtml	Switches superclass-method notice rendering to the new helper.
lib/rdoc/generator/markup.rb	Introduces RDoc::AnyMethod#superclass_method_link for generator use.

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