Fix javadoc warnings

Change-Id: I3887b7ddcdad8af211159d65c82f879d4447a835

src/main/java/com/googlesource/gerrit/plugins/hooks/util/IssueExtractor.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/hooks/util/IssueExtractor.java b/src/main/java/com/googlesource/gerrit/plugins/hooks/util/IssueExtractor.java
index b2ebbc4..cdf4a09 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/hooks/util/IssueExtractor.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/hooks/util/IssueExtractor.java
@@ -43,7 +43,7 @@
    * Gets issue ids from a string.
    *
    * @param haystack String to extract issue ids from
-   * @return array of {@link Strings}. Each String being a found issue id.
+   * @return array of {@link String}. Each String being a found issue id.
    */
   public String[] getIssueIds(String haystack) {
     Pattern pattern = getPattern();

src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Condition.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Condition.java b/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Condition.java
index 5fc79a8..aca340e 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Condition.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Condition.java
@@ -24,6 +24,8 @@
 import com.google.inject.Inject;
 import com.google.inject.assistedinject.Assisted;
 
+import com.googlesource.gerrit.plugins.hooks.workflow.action.Action;
+
 /**
  * A condition as used in {@link Rule}, as precondition to {@link Action}s.
  * <p>

src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Rule.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Rule.java b/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Rule.java
index 512af73..5fb58d1 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Rule.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/Rule.java
@@ -59,7 +59,7 @@
   /**
    * Adds an action to the rule.
    *
-   * @param action The action to add.
+   * @param actionRequest The action to add.
    */
   public void addActionRequest(ActionRequest actionRequest) {
     actionRequests.add(actionRequest);