fix(defineMedia): replace tab with spaces in redirect_from YAML (#6566)

The YAML front matter in defineMedia.md used a hard tab character
to indent the redirect_from list item. YAML does not allow tabs as
indentation, causing Jekyll to throw a parse error and skip the file
entirely. As a result, the Define Media adapter was not rendered on
the download page.

Replace the tab with two spaces to fix the YAML parse error.

Co-authored-by: flow1907 <mklumpp84@gmail.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>