add some Apache release validation links to phase1 email template
diff --git a/gradle/phase1.gradle b/gradle/phase1.gradle
index aa85818..a0f556f 100644
--- a/gradle/phase1.gradle
+++ b/gradle/phase1.gradle
@@ -267,7 +267,7 @@
 
 ---------------- >8 -----------------
 
-Dear community,
+Dear development community,
 
 I am happy to start the VOTE thread for a Groovy $relVersion release!
 
@@ -286,6 +286,11 @@
 
 Please vote on releasing this package as Apache Groovy $relVersion.
 
+Reminder on ASF release approval requirements for PMC members:
+http://www.apache.org/legal/release-policy.html#release-approval
+Hints on validating checksums/signatures (but replace md5sum with sha256sum):
+https://www.apache.org/info/verification.html
+
 The vote is open for the next 72 hours and passes if a majority of at least three +1 PMC votes are cast.
 
 [ ] +1 Release Apache Groovy $relVersion