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/vector-change-direction/vector-change-direction.tex

@@ -1,7 +1,7 @@
 \documentclass[varwidth=true, border=2pt]{standalone}
 \usepackage{tkz-euclide}
 \usepackage{tikz}
-\usetikzlibrary{shapes, calc, shapes, arrows} 
+\usetikzlibrary{shapes, calc, shapes, arrows}
 \usepackage{amsmath,amssymb}
 
 \usepackage{xcolor}