Remove 'VERSION' from the text

We removed `VERSION` file in this PR:
https://github.com/moby/moby/pull/35368

Signed-off-by: Lei Jitang <leijitang@outlook.com>

project/REVIEWING.md

@@ -226,12 +226,10 @@ review session. The goal of that session is to agree on one of the following out
 ## Milestones
 
 Typically, every merged pull request get shipped naturally with the next release cut from the
-`master` branch (either the next minor or major version, as indicated by the
-[`VERSION`](https://github.com/docker/docker/blob/master/VERSION) file at the root of the
-repository). However, the time-based nature of the release process provides no guarantee that a
-given pull request will get merged in time. In other words, all open pull requests are implicitly
-considered part of the next minor or major release milestone, and this won't be materialized on
-GitHub.
+`master` branch (either the next minor or major version). However, the time-based nature of the
+release process provides no guarantee that a given pull request will get merged in time. In other
+words, all open pull requests are implicitly considered part of the next minor or major release
+milestone, and this won't be materialized on GitHub.
 
 A merged pull request must be attached to the milestone corresponding to the release in which it
 will be shipped: this is both useful for tracking, and to help the release manager with the