update start date

Author: DanielEScherzer

docs/release-process.md

@@ -19,9 +19,9 @@ publish patch-level releases every four weeks, with at least one release
 candidate (RC) published two weeks before each patch-level release.
 
 Each major and minor version undergoes a 20-week pre-release cycle before GA
-release. The pre-release cycle begins on the second Thursday of June with the
-first alpha release of the new major/minor version. The pre-release cycle
-consists of at least:
+release. The pre-release cycle begins on the second Thursday of July with the
+first alpha release of the new major/minor version (usually; count back from the
+GA release date). The pre-release cycle consists of at least:
 
 - 3 alpha releases
 - 3 beta releases