Remove trailing spaces

The commands

find . -type f -name '*.md' -exec sed --in-place 's/[[:space:]]\+$//' {} \+

and

find . -type f -name '*.tex' -exec sed --in-place 's/[[:space:]]\+$//' {} \+

were used to do so.

tikz/multidimensional-intervall/multidimensional-intervall.tex

@@ -18,7 +18,7 @@
 
     \fill[green!15] (a) -- (b) -- (c) -- (d) -- (a);
 
-    % Draw lines indicating intersection with y and x axis. Here we 
+    % Draw lines indicating intersection with y and x axis. Here we
     % use the perpendicular coordinate system
     \draw[dotted] (yaxis |- a) node[left] {$a_2$}
         -| (xaxis -| a) node[below] {$a_1$};