[css-anchor-position] Rename position-try-options to *fallbacks
The position-try-options property was renamed in the specification. The
values are still the same.
The position-try-options name will still be an alternative one until it
is unshipped.
Bug: 349600667
Change-Id: I9886c8f592e283f2b72be21153d376f1d848e0a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5667406
Commit-Queue: Philip Jägenstedt foolip@chromium.org
Reviewed-by: Anders Hartvoll Ruud andruud@chromium.org
Reviewed-by: Philip Jägenstedt foolip@chromium.org
Auto-Submit: Rune Lillesveen futhark@chromium.org
Cr-Commit-Position: refs/heads/main@{#1323315}