Removals come >=1 major release after deprecation. (electron#12164)

ckerr · web-flow · commit b330ff80044a · 2018-03-08T11:18:36.000+09:00
diff --git a/docs/tutorial/planned-breaking-changes.md b/docs/tutorial/planned-breaking-changes.md
@@ -3,7 +3,7 @@
 The following list includes the APIs that will be removed in Electron 2.0.
 
 There is no timetable for when this release will occur but deprecation
-warnings will be added at least 90 days beforehand.
+warnings will be added at least [one major version](electron-versioning.md#semver) beforehand.
 
 ## `app`
 
