.gitignore was ignoring a documentation directory so added am explicit pattern retain it

Change-Id: I5db8220a95bc0a0b2b360db5588d70ef763e4599
diff --git a/VERSION b/VERSION
index 6d27db5..cf686df 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.10.15
+2.10.16