Merge pull request #26027 from github/repo-sync

Repo sync

Author: Octomerger

src/content-linter/README.md

@@ -9,6 +9,7 @@ We are using the [markdownlint](https://github.com/DavidAnson/markdownlint) fram
 | [MD001](https://github.com/DavidAnson/markdownlint/blob/main/doc/md001.md) | Header levels can only increments by one level at a time. | error |
 | [MD002](https://github.com/DavidAnson/markdownlint/blob/main/doc/md002.md) | Ensure that headings start with an H2 heading. | error |
 | [MD004](https://github.com/DavidAnson/markdownlint/blob/main/doc/md004.md) | Unordered list style must be a dash. | error |
+| [MD009](https://github.com/DavidAnson/markdownlint/blob/main/doc/md009.md) | No unnecessary whitespace from the end of the line. | warning |
 | [MD014](https://github.com/DavidAnson/markdownlint/blob/main/doc/md014.md) | Dollar signs should not be used before commands without showing output. | error |
 | [MD024](https://github.com/DavidAnson/markdownlint/blob/main/doc/md024.md) | Disallow headings with the same content. | error |
 | [MD111](./linting-rules/image-alt-text-length.js) | Images alternate text should be between 40-150 characters. | warning |

src/content-linter/scripts/markdownlint.js

@@ -29,6 +29,7 @@ async function main() {
     MD001: true,
     MD002: { level: 2 },
     MD004: { style: 'dash' },
+    MD009: true,
     MD014: true,
     MD024: true,
     MD111: true,