[build] Include cheatsheets folder to build

doc/org.eclipse.mylyn.docs.intent.idoc/build.properties

diff --git a/doc/org.eclipse.mylyn.docs.intent.idoc/build.properties b/doc/org.eclipse.mylyn.docs.intent.idoc/build.properties
index 7c48cd8..afb570a 100644
--- a/doc/org.eclipse.mylyn.docs.intent.idoc/build.properties
+++ b/doc/org.eclipse.mylyn.docs.intent.idoc/build.properties
@@ -6,4 +6,5 @@
                build.properties,\
                plugin.properties,\
                plugin.xml,\
-               html/
+               html/,\
+               cheatsheets/