Crystal docs: Use fully qualified name for entries

[spuun]

Currently entities name for Crystal is just the short version making it impossible to distinguish search hits:

This PR will change entry name to be the fully qualified name:

It also enables searches like "json builder", which isn't possible today.

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If you're updating existing documentation to its latest version, please ensure that you have:

• Updated the versions and releases in the scraper file
• Ensured the license is up-to-date
• Ensured the icons and the SOURCE file in public/icons/your_scraper_name/ are up-to-date if the documentation has a custom icon
• Ensured self.links contains up-to-date urls if self.links is defined
• Tested the changes locally to ensure:
  • The scraper still works without errors
  • The scraped documentation still looks consistent with the rest of DevDocs
  • The categorization of entries is still good