docs(ollama): update ollama.mdx with note about basic auth support

[btelles]

This is related to #25055

Although langchain now allows users to specify headers, the client itself does not gracefully handle a standard URL of the form https://user:[email protected]:11343

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 30, 2025 4:02pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32327 will not alter performance

_{Comparing btelles:patch-1 (3027752) with master (a9e52ca)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32327 will not alter performance

_{Comparing btelles:patch-1 (3027752) with master (a9e52ca)}

Summary

✅ 14 untouched benchmarks

[mdrxy]

@btelles have a look at #32328 and let me know if that looks suitable

[btelles]

@btelles have a look at #32328 and let me know if that looks suitable

Yes! Amazing! Thanks!