Java: Formatting tweaks to READMEs

They looked funny when rendered on github.

tensorflow/java/README.md

@@ -34,7 +34,7 @@ That's all. As an example, to create a Maven project for the
 1.  Create a `pom.xml`:
 
     ```xml
-<project>
+    <project>
         <modelVersion>4.0.0</modelVersion>
         <groupId>org.myorg</groupId>
         <artifactId>label-image</artifactId>
@@ -53,7 +53,7 @@ That's all. As an example, to create a Maven project for the
             <version>1.1.0-rc0-windows-fix</version>
           </dependency>
         </dependencies>
-</project>
+    </project>
     ```
 
 2.  Download the [example source](https://raw.githubusercontent.com/tensorflow/tensorflow/master/tensorflow/java/src/main/java/org/tensorflow/examples/LabelImage.java)

tensorflow/java/maven/README.md

@@ -68,7 +68,7 @@ conducted in a [Docker](https://www.docker.com) container.
     SONATYPE_PASSWORD="your_sonatype.org_password_here"
     GPG_PASSPHRASE="your_gpg_passphrase_here"
     cat >/tmp/settings.xml <<EOF
-<settings>
+    <settings>
       <servers>
         <server>
           <id>ossrh</id>
@@ -88,8 +88,8 @@ conducted in a [Docker](https://www.docker.com) container.
           </properties>
         </profile>
       </profiles>
-</settings>
-EOF
+    </settings>
+    EOF
     ```
 
 2.  Run the `release.sh` script.