Cleaning up javadoc warnings

pom.xml

@@ -3,7 +3,7 @@
   <parent>
     <groupId>org.kohsuke</groupId>
     <artifactId>pom</artifactId>
-    <version>14</version>
+    <version>17</version>
   </parent>
 
   <artifactId>github-api</artifactId>

src/main/java/org/kohsuke/github/GHRelease.java

@@ -121,9 +121,7 @@ public class GHRelease extends GHObject {
      * Java 7 or greater.  Options for fixing this for earlier JVMs can be found here
      * http://stackoverflow.com/questions/12361090/server-name-indication-sni-on-java but involve more complicated
      * handling of the HTTP requests to github's API.
-     *
-     * @throws IOException
-     */
+         */
     public GHAsset uploadAsset(File file, String contentType) throws IOException {
         Requester builder = new Requester(owner.root);
 

src/main/java/org/kohsuke/github/GHReleaseBuilder.java

@@ -33,7 +33,6 @@ public class GHReleaseBuilder {
      *
      * @param commitish Defaults to the repository’s default branch (usually "master"). Unused if the Git tag
      *                  already exists.
-     * @return
      */
     public GHReleaseBuilder commitish(String commitish) {
         if (commitish != null) {

src/main/java/org/kohsuke/github/GHRepository.java

@@ -449,7 +449,6 @@ public class GHRepository extends GHObject {
      * Lists up the collaborators on this repository.
      *
      * @return Users
-     * @throws IOException
      */
     public PagedIterable<GHUser> listCollaborators() throws IOException {
         return listUsers("collaborators");
@@ -818,7 +817,7 @@ public class GHRepository extends GHObject {
     }
 
     /**
-     * Obtains the metadata & the content of a blob.
+     * Obtains the metadata &amp; the content of a blob.
      *
      * <p>
      * This method retrieves the whole content in memory, so beware when you are dealing with large BLOB.

src/main/java/org/kohsuke/github/GHTree.java

@@ -30,7 +30,6 @@ public class GHTree {
 
     /**
      * Return an array of entries of the trees
-     * @return
      */
     public List<GHTreeEntry> getTree() {
         return Collections.unmodifiableList(Arrays.asList(tree));

src/main/java/org/kohsuke/github/GitHub.java

@@ -416,7 +416,6 @@ public class GitHub {
      *
      * @param key The license key provided from the API
      * @return The license details
-     * @throws IOException
      * @see GHLicense#getKey()
      */
     @Preview @Deprecated