fix typo in foldername

2 lat temu · 90b01a491f
--- a/ws2023/gruppenschemata/lec.pdf
+++ b/ws2023/gruppenschemata/lec.pdf
--- a/ws2023/gruppenschemata/lec.tex
+++ b/ws2023/gruppenschemata/lec.tex
--- a/ws2023/gruppenschemata/lec01.pdf
+++ b/ws2023/gruppenschemata/lec01.pdf
--- a/ws2023/gruppenschemata/lec01.tex
+++ b/ws2023/gruppenschemata/lec01.tex
--- a/ws2023/gruppenschemata/lecture.cls
+++ b/ws2023/gruppenschemata/lecture.cls