docs: Update invalid property in a configuration example (#38466)

Just install Zed for the first time and got a warning from the first
config example i copied from docs.
Great design btw, immediately able to see that this is a well thought
out app. seems like i'll stick with zed and make it my new dev
'sanctuary'.

Release Notes:

- N/A
94fcbb400bDimas Ari committed on 9/19/2025, 2:36:36 PM· committed by GitHubparent2e97ef3
1 file changedLine totals unavailable