Fix several JavaDoc issues

Author: neutralleiter

core/src/main/java/eu/bittrade/libs/steemj/base/models/operations/VoteOperation.java

@@ -40,7 +40,7 @@ public class VoteOperation extends Operation {
      *            {@link #setAuthor(AccountName)}.
      * @param permlink
      *            Set the permanent link of the post/comment to vote for.
-     *            {@link #setPermlink(String)}.
+     *            {@link #setPermlink(Permlink)}.
      * @param weight
      *            Set the voting weight. {@link #setWeight(short)}.
      * @throws InvalidParameterException
@@ -58,9 +58,8 @@ public VoteOperation(@JsonProperty("voter") AccountName voter, @JsonProperty("au
     }
 
     /**
-     * Like {@link #VoteOperation(AccountName, AccountName, String, short)
-     * VoteOperation(AccountName, AccountName, String, short)}, but will use a
-     * default weight of '0'.
+     * Like {@link #VoteOperation(AccountName, AccountName, Permlink, short)},
+     * but will use a default weight of '0'.
      * 
      * @param voter
      *            Set the account that votes. {@link #setVoter(AccountName)}.

core/src/main/java/eu/bittrade/libs/steemj/base/models/operations/WitnessUpdateOperation.java

@@ -70,7 +70,7 @@ public class WitnessUpdateOperation extends Operation {
      *            {@link #setBlockSigningKey(PublicKey)}).
      * @param properties
      *            The chain properties the witness is voting for (see
-     *            {@link #setChainProperties}).
+     *            {@link #setProperties(ChainProperties)}).
      * @param fee
      *            The fee to pay for this update (see {@link #setFee(Asset)}).
      */

core/src/main/java/eu/bittrade/libs/steemj/communication/BlockAppliedCallback.java

@@ -7,8 +7,7 @@
 /**
  * This abstract class is used as a standard wrapper for a block applied
  * callback. It is needed to handle callbacks of the
- * {@link eu.bittrade.libs.steemj.Steemj#setBlockAppliedCallback(BlockAppliedCallback)
- * setBlockAppliedCallback(BlockAppliedCallback)}.
+ * {@link eu.bittrade.libs.steemj.SteemJ#setBlockAppliedCallback(BlockAppliedCallback)}.
  * 
  * @author <a href="http://steemit.com/@dez1337">dez1337</a>
  */