Update getppm.m

This commit addresses one of the issues mentioned in the pull request  "changes to address issues with new xcode changes" #54 by @theoneineed .

Author: shahmoradi

src/matlab/main/+pm/+sampling/@Paradram/getppm.m

@@ -17,7 +17,7 @@
 %>  \author
 %>  \AmirShahmoradi, September 1, 2012, 12:00 AM, National Institute for Fusion Studies, The University of Texas at Austin<br>
 function ppm = getppm(self)
-    baselink = self._weblinks.docs.generic.usage.sampling.paradram.quickstart.url
+    baselink = self.weblinks.docs.generic.usage.sampling.paradram.quickstart.url
     ppm = [email protected](self) ...
         + "Use the following object method to read the generated basic output chain file and and unroll the contents as a Markov Chain: " + newline ...
         + newline ...