Adding */docs/* to onos-build-selective.exclude

fixes ONOS-1779

Change-Id: I8dbb8d05fa5d529a9fc4dedf806968e1ae1256d5
diff --git a/tools/dev/bin/onos-build-selective.exclude b/tools/dev/bin/onos-build-selective.exclude
index cd36a91..6cb40fe 100644
--- a/tools/dev/bin/onos-build-selective.exclude
+++ b/tools/dev/bin/onos-build-selective.exclude
@@ -1,3 +1,4 @@
 .*/archetypes/.*
 .*/maven-plugin/.*
-.*/build/conf/.*
\ No newline at end of file
+.*/build/conf/.*
+.*/docs/.*