Fix some XML tags in ADOC examples

Author: kriegaex

src/site/asciidoc/examples/differentTestAndCompile.adoc

@@ -48,7 +48,7 @@ To have different weaving configurations for the main and test classes, you can
       </plugin>
       <!-- ... -->
     </plugins>
-  <build>
+  </build>
   <!-- ... -->
 </project>
 ----

src/site/asciidoc/examples/includeExclude.adoc

@@ -57,7 +57,7 @@ just add an empty `sources` tag, i.e. `<sources/>` (Maven 3 style) or `<sources>
       </plugin>
       <!-- ... -->
     </plugins>
-  <build>
+  </build>
   <!-- ... -->
 </project>
 ----

src/site/asciidoc/examples/libraryJars.adoc

@@ -60,7 +60,7 @@ weaving in the plugin configuration as shown below.
       </plugin>
       <!-- ... -->
     </plugins>
-  <build>
+  </build>
   <!-- ... -->
 </project>
 ----

src/site/asciidoc/examples/usingTogetherWithAJDT.adoc

@@ -40,7 +40,7 @@ overrides the configured project source folders. Any include or exclude elements
       </plugin>
       <!-- ... -->
     </plugins>
-  <build>
+  </build>
   <!-- ... -->
 </project>
 ----

src/site/asciidoc/examples/weaveDirectories.adoc

@@ -54,7 +54,7 @@ specify the folder(s) with the compiled classes via `weaveDirectories` and execu
       </plugin>
       <!-- ... -->
     </plugins>
-  <build>
+  </build>
   <!-- ... -->
 </project>
 ----

src/site/asciidoc/examples/weaveJars.adoc

@@ -62,7 +62,7 @@ you need do configure all the JAR files you want to weave in the plugin configur
       </plugin>
       <!-- ... -->
     </plugins>
-  <build>
+  </build>
   <!-- ... -->
 </project>
 ----

src/site/asciidoc/usage.adoc

@@ -42,7 +42,7 @@ Below follows a standard single-project usage example.
       </plugin>
       <!-- ... -->
     </plugins>
-  <build>
+  </build>
   <!-- ... -->
 </project>
 ----
@@ -99,7 +99,7 @@ used by the compiled module in sync with it.
       </plugin>
       ...
     </plugins>
-  <build>
+  </build>
   <!-- ... -->
 </project>
 ----