Fix the comment on the git repo for the labs.

Author: janpgit

docs/index.html

@@ -102,7 +102,7 @@ <h2><a name="exams">Exams</a></h2>
 
 <h2><a name="practices">Practices and class assignments</a></h2>
 
-<p>Some code from the practices: <a
+<p>Assignments from the labs: <a
 href="https://github.com/devnull-cz/unix-linux-prog-in-c-labs">unix-linux-prog-in-c-labs@github</a>
 
 <a name="consultations"><h2>Consulations</h2></a>