Merge pull request #1999 from edx/anton/fix-typos-in-announcement

Fix typos in Announcement template.

common/lib/xmodule/xmodule/templates/html/announcement.yaml

@@ -8,7 +8,7 @@ data: |
       <section class='update-description'>
       	       <section class='primary'>
       	       		<p> Words of encouragement! This is a short note that most students will read. </p>
-      	       		<p class='author'>Anant  Agarwal (6.002x Principle Instructor)</p>
+      	       		<p class='author'>Anant  Agarwal (6.002x Principal Instructor)</p>
       	       </section>
       	       <p><h3>Primary versus Secondary Updates:</h3> Unfortunately, the internet throws a lot of text at students, and they
       	       do not read everything that they are given. However, many students <em>do</em> read all that they are
@@ -16,7 +16,7 @@ data: |
       	       Any essential information should be extremely quickly summarized in the primary section for skimmers.</p>
       	       <p><h3>Star Forum Poster</h3>
       	       Students appriciate knowing that the course staff is reading what they post, and one of several ways
-      	       that you can do this is by acknowledging the start posters in your announcements.
+      	       that you can do this is by acknowledging the star posters in your announcements.
       	       </p>
       </section>
       </li>