Documentation: Specify JRE rather than JDK

It should not be necessary to require the JDK to run Gerrit. The JRE
should be enough.

Change-Id: Iaac64bc37c5cc4b352d1a489e6bc3c71ccd0fd8b
diff --git a/Documentation/install-quick.txt b/Documentation/install-quick.txt
index a8115db..d665226 100644
--- a/Documentation/install-quick.txt
+++ b/Documentation/install-quick.txt
@@ -33,7 +33,7 @@
 
 If Java isn't installed, get it:
 
-* JDK, minimum version 1.8 http://www.oracle.com/technetwork/java/javase/downloads/index.html[Download]
+* JRE, minimum version 1.8 http://www.oracle.com/technetwork/java/javase/downloads/index.html[Download]
 
 
 [[user]]
diff --git a/Documentation/install.txt b/Documentation/install.txt
index 86c9f9a..f0a1730 100644
--- a/Documentation/install.txt
+++ b/Documentation/install.txt
@@ -5,7 +5,7 @@
 To run the Gerrit service, the following requirements must be met on
 the host:
 
-* JDK, minimum version 1.8 http://www.oracle.com/technetwork/java/javase/downloads/index.html[Download]
+* JRE, minimum version 1.8 http://www.oracle.com/technetwork/java/javase/downloads/index.html[Download]
 
 You'll also need an SQL database to house the review metadata. You have the
 choice of either using the embedded H2 or to host your own MySQL or PostgreSQL.