Fix javadoc compilation errors

Java 8 javadoc must return no errors from doclint or the whole step
fails. We have a lot of warnings and a few errors; fix the errors.

Change-Id: I8ddfb4384c17443dd95c9fe0bfae32a7020b5804
diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/BaseServlet.java b/gitiles-servlet/src/main/java/com/google/gitiles/BaseServlet.java
index 240a3a7..dbe3099 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/BaseServlet.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/BaseServlet.java
@@ -256,8 +256,8 @@
    *
    * @param req in-progress request.
    * @param res in-progress response.
-   * @param src @see Gson#toJson(Object, Type, Appendable)
-   * @param typeOfSrc @see Gson#toJson(Object, Type, Appendable)
+   * @param src @see com.google.gson.Gson#toJson(Object, Type, Appendable)
+   * @param typeOfSrc @see com.google.gson.Gson#toJson(Object, Type, Appendable)
    */
   protected void renderJson(HttpServletRequest req, HttpServletResponse res, Object src,
       Type typeOfSrc) throws IOException {
diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/GitilesUrls.java b/gitiles-servlet/src/main/java/com/google/gitiles/GitilesUrls.java
index 7bbc2f3..fdf577d 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/GitilesUrls.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/GitilesUrls.java
@@ -29,7 +29,7 @@
    * Escapes repository or path names to be safely embedded into a URL.
    * <p>
    * This escape implementation escapes a repository or path name such as
-   * "foo/bar</child" to appear as "foo/bar%3C/child". Spaces are escaped as
+   * "foo/bar&lt;/child" to appear as "foo/bar%3C/child". Spaces are escaped as
    * "%20". Its purpose is to escape a repository name to be safe for inclusion
    * in the path component of the URL, where "/" is a valid character that
    * should not be encoded, while almost any other non-alpha, non-numeric