Refactor and expand documentation for cornering control in speed_settings_jerk_xy.md: add a Key Effects section, reorganize Cornering Control Types, consolidate and clarify Junction Deviation (include formula, tips, and notes about Marlin/Classic Jerk), remove duplicated content, and explain how Orca limits jerk to Printer Motion Ability. Update printer_settings/motion ability/printer_motion_ability.md: reorder sections to place Maximum Junction Deviation after Maximum Jerk, update variable descriptions and link references, and clarify when M205 J/X/Y/Z/E apply.
Update image and internal link validation workflows to scan all Markdown files in the repository instead of only those changed in a pull request. This improves coverage and reliability by ensuring all relevant files are validated regardless of PR diff context.
Introduces a GitHub Actions workflow that checks for invalid internal links in Markdown files on pull requests. The workflow validates document references and heading anchors, reporting errors for missing or ambiguous documents, invalid anchors, and improper link formats.
