#5195: update expose ollama to network settings in docs

<!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates the Ollama provider documentation to add a quick-start prerequisite reminding users to enable Ollama’s “Expose Ollama to the network” setting, and renumbers the subsequent quick-start steps accordingly. This fits into the docs/providers section by clarifying a common connectivity/setup requirement for OpenClaw’s Ollama integration. <h3>Confidence Score: 4/5</h3> - This PR is low-risk and safe to merge, with one likely-overbroad docs instruction to consider adjusting. - Change is documentation-only and limited to quick-start step text/renumbering; the main concern is that the new prerequisite may mislead users and encourages a less secure configuration when not needed. - docs/providers/ollama.md <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} **Context used:** - Context from `dashboard` - CLAUDE.md ([source](https://app.greptile.com/review/custom-context?memory=fd949e91-5c3a-4ab5-90a1-cbe184fd6ce8)) - Context from `dashboard` - AGENTS.md ([source](https://app.greptile.com/review/custom-context?memory=0d0c8278-ef8e-4d6c-ab21-f5527e322f13)) <!-- /greptile_comment -->