fix link

Author: vladak

docs/index.html

@@ -25,7 +25,7 @@ <h1>Unix/Linux Programming in C (NSWI015)</h1>
 href="http://is.cuni.cz/studium/predmety/index.php?do=predmet&amp;kod=NSWI015">NSWI015</a>,
 <a href="http://mff.cuni.cz">MFF UK</a>, winter semester 2023/2024</font></b>
 
-<p><b>Lecture: Mon 9:00 <a href="https://www.ms.mff.cuni.cz/tourist/msbuilding.html.en#end">S6/a>
+<p><b>Lecture: Mon 9:00 <a href="https://www.ms.mff.cuni.cz/tourist/msbuilding.html.en#end">S6</a>
 (<a href="https://www.mff.cuni.cz/en/internal-affairs/buildings-and-campuses/mala-strana">Mal&aacute; Strana</a>)<br>
 Labs: Mon 10:40 <a href="https://www.ms.mff.cuni.cz/tourist/msbuilding.html.en#end">SU1</a>
 (<a href="https://www.mff.cuni.cz/en/internal-affairs/buildings-and-campuses/mala-strana">Mal&aacute; Strana</a>)</br>