docs: don't wait for ready event to register open-url listener (#35019)
docs: don't wait for ready event to register open-url listener (#35019)

* Update app.md

Add warning about late registration of the open-url event.

* Update app.md
gerhardberger/electron,electron/electron,gerhardberger/electron,electron/electron,gerhardberger/electron,gerhardberger/electron,electron/electron,gerhardberger/electron,electron/electron,electron/electron,gerhardberger/electron,gerhardberger/electron,electron/electron,electron/electron