fix: links to Anki Manual URLs containing `--`

[snowtimeglass]

Purpose / Description

Anki Desktop manual has some sections which URLs contain two consecutive hyphens (--), but in AnkiDroid manual, the links which should be connected to the URLs actually have different URLs, and as a result the links don't open the sections.

• Ex.
  • Actual URL: https://docs.ankiweb.net/templates/generation.html#card-generation--deletion https://docs.ankiweb.net/templates/generation.html#card-generation--deletion
  • Different URL: https://docs.ankiweb.net/templates/generation.html#card-generation-amp-deletion https://docs.ankiweb.net/templates/generation.html#card-generation-amp-deletion

This commit will replace the different URLs with actual ones.

Fixes

Fixes #116

Approach

Simple replacement from -amp- to -- would cause undesirable substitution by AsciiDoc formatting.

• Ex. https://docs.ankiweb.net/templates/generation.html#card-generation--E2%80%8Bdeletion https://docs.ankiweb.net/templates/generation.html#card-generation--E2%80%8Bdeletion

To prevent it, the replaced URL will be enclosed between link:++ and ++

• Ex. link:++https://docs.ankiweb.net/templates/generation.html#card-generation--deletion++

• Ref: AsciiDoc > Passthroughs > Inline Passthroughs > Single and double plus https://docs.asciidoctor.org/asciidoc/latest/pass/pass-macro/#single-double-plus

How Has This Been Tested?

Checked the preview screen of manual.asc in this branch and confirmed that the correct sections are shown by clicking the link texts.