Consistent usage of m2e for all JaCoCo projects.

Avoid dependency on MANIFEST.MF files and PDE.
diff --git a/org.jacoco.doc/docroot/doc/build.html b/org.jacoco.doc/docroot/doc/build.html
index cfc7b28..8a19e73 100644
--- a/org.jacoco.doc/docroot/doc/build.html
+++ b/org.jacoco.doc/docroot/doc/build.html
@@ -112,6 +112,17 @@
       <jdkHome>/usr/lib/jvm/sun-jdk-1.7</jdkHome>
     </configuration>
   </toolchain>
+  <toolchain>
+    <type>jdk</type>
+    <provides>
+      <id>java18</id>
+      <version>1.8</version>
+      <vendor>sun</vendor>
+    </provides>
+    <configuration>
+      <jdkHome>/usr/lib/jvm/sun-jdk-1.8</jdkHome>
+    </configuration>
+  </toolchain>
 </toolchains>
 </pre>
 
@@ -140,9 +151,10 @@
 </p>
 
 <ul>
-  <li>Maven with 1.5 JRE: <code>mvn clean install -Djdk.version=1.5 -Dbytecode.version=1.5</code></li>
-  <li>Maven with 1.6 JRE: <code>mvn clean install -Djdk.version=1.6 -Dbytecode.version=1.6</code></li>
-  <li>Maven with 1.7 JRE: <code>mvn clean install -Djdk.version=1.7 -Dbytecode.version=1.7</code></li>
+  <li>Maven with 1.5 JDK: <code>mvn clean install -Djdk.version=1.5 -Dbytecode.version=1.5</code></li>
+  <li>Maven with 1.6 JDK: <code>mvn clean install -Djdk.version=1.6 -Dbytecode.version=1.6</code></li>
+  <li>Maven with 1.7 JDK: <code>mvn clean install -Djdk.version=1.7 -Dbytecode.version=1.7</code></li>
+  <li>Maven with 1.8 JDK: <code>mvn clean install -Djdk.version=1.8 -Dbytecode.version=1.8</code></li>
 </ul>