docs: Documentation update

Update INSTALL.rst with Ubuntu 14.04 information and correct
spelling error of "Interest" in examples.rst.

Change-Id: I82a43983ca843420281eae503454ebf2dda72199
diff --git a/docs/examples.rst b/docs/examples.rst
index 7e901ec..e512c72 100644
--- a/docs/examples.rst
+++ b/docs/examples.rst
@@ -31,7 +31,7 @@
 
 The following example demonstrates how to write a simple producer application.
 
-First, the application sets an Interset filter for ``/localhost/testApp`` to receive all
+First, the application sets an Interest filter for ``/localhost/testApp`` to receive all
 Interests that have this prefix.  The :ndn-cxx:`Face::setInterestFilter` call accepts two
 callbacks; the first will be called when an Interest is received and the second if prefix
 registration fails.