Javadoc fixes in imagegen, sam, crypto

.../src/main/java/com/docuverse/identicon/IdenticonUtil.java

.../com/docuverse/identicon/NineBlockIdenticonRenderer2.java

...n/core/src/main/java/com/docuverse/identicon/package.html

...bapp/src/main/java/net/i2p/imagegen/IdenticonServlet.java

...egen/webapp/src/main/java/net/i2p/imagegen/QRServlet.java

...agegen/webapp/src/main/java/net/i2p/imagegen/package.html

...en/zxing/core/src/main/java/com/google/zxing/package.html

apps/sam/java/src/net/i2p/sam/SAMMessageSession.java

apps/sam/java/src/net/i2p/sam/SAMv1Handler.java

apps/sam/java/src/net/i2p/sam/SAMv3StreamSession.java

core/java/src/net/i2p/crypto/KeyStoreUtil.java