[OpenMP][docs] Finish MyST migration for OpenMP docs (#222194) This was prepared with rst2myst plus LLM-assisted cleanup. The main manual intervention was porting CommandLineArgumentReference.(rst|md) to the semantic [`option` directive](https://www.sphinx-doc.org/en/master/usage/domains/standard.html#directive-option), which causes some rendering differences. Tracking issue: #201242 See the [migration guide] for more information. [migration guide]: https://llvm.org/docs/SphinxQuickstartTemplate.html#markdown-migration-guidelines This is a stacked PR based on #222191, which is a standalone commit that renames *.rst -> *.md before this PR lands for history preservation purposes. Please spot check my work and approve if it looks good. 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`openmp/docs/remarks/OptimizationRemarks.md` | [before](https://llvmdocs.staging.reidkleckner.dev/before/openmp/docs/remarks/OptimizationRemarks.html) | [after](https://llvmdocs.staging.reidkleckner.dev/after/openmp/docs/remarks/OptimizationRemarks.html) | --------- Co-authored-by: Michael Kruse <llvm-project@meinersbur.de> GitOrigin-RevId: d0e55509a1cdfec0802d8b9e254ca2456a04175c