docs: fixed incorrect local/ollama/... provider prefix

docs/providers.rst

@@ -10,7 +10,7 @@ To select a provider and model, run ``gptme`` with the ``--model`` flag set to `
     gptme --model openai/gpt-4o "hello"
     gptme --model anthropic "hello"  # if model part unspecified, will fall back to the provider default
     gptme --model openrouter/meta-llama/llama-3.1-70b-instruct "hello"
-    gptme --model local/ollama/llama3.2:1b "hello"
+    gptme --model local/llama3.2:1b "hello"
 
 On first startup, if `--model` is not set, and no API keys are set in the config or environment it will be prompted for. It will then auto-detect the provider, and save the key in the configuration file.