Update Javadocs with @snippet tags.

Change-Id: I22f440c6ced5b90cdebc1fdf068171e7baad180f
diff --git a/.gitignore b/.gitignore
index 8cc2382..8d8bbbe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,7 +9,9 @@
 target/
 
 .envrc
+.flattened-pom.xml
 
 *~
 *.class
 *.iml
+*.versionsBackup