Fix explicit provider example (docs)

[patriciomacadden]

What this does

I was trying ruby_llm for the first time and wanted to try the ollama provider. I searched the documentation and found this snippet that set the ollama provider and the base url at the same time, but in the console it threw an error:

unknown keyword: :base_url (ArgumentError)

After looking the RubyLLM::Chat class I found there is no base_url argument and i need to either run RubyLLM.configure { ... } of pass a context.

Also, I'm running the latest ollama (0.12.3), and http://localhost:11434 isn't working for me. I have to append /v1 for it to work.

Perhaps there's a better way of doing this (correct me if I'm wrong!) but I wanted to fix the docs, and found this way of doing it.

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation
• Performance improvement

Scope check

• I read the Contributing Guide
• This aligns with RubyLLM's focus on LLM communication
• This isn't application-specific logic that belongs in user code
• This benefits most users, not just my specific use case

Quality check

• I ran overcommit --install and all hooks pass
• I tested my changes thoroughly
  • For provider changes: Re-recorded VCR cassettes with bundle exec rake vcr:record[provider_name]
  • All tests pass: bundle exec rspec
• I updated documentation if needed
• I didn't modify auto-generated files manually (models.json, aliases.json)

API changes

• Breaking change
• New public methods/classes
• Changed method signatures
• No API changes

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