minor fix: "the same directory" -> "in the same directory"

Tutorials/T02a-LaTeX/slides/T2.tex

@@ -451,7 +451,7 @@ McMaster University\\ }
     \begin{figure}[h]
       \centering
 
-      % assuming we have an image file called img.png the
+      % assuming we have an image file called img.png in the
       % same directory as our .tex source, this will create
       % a figure with the image img.png, and scale it to
       % 0.3 times the width of the document text