Fix misspellings (#378)

* Fix misspellings

* Revert to US English

* fix a word

book/booklet.tex

@@ -119,7 +119,7 @@ flattened out a lot.}%
     \end{subfigure}
     \begin{subfigure}{.475\linewidth}
       \includegraphics[width=\linewidth]{step-1-flour-applied}
-      \caption*{Step 1: Apply flpour to the dough's surface.}%
+      \caption*{Step 1: Apply flour to the dough's surface.}%
     \end{subfigure}\hfill % <-- "\hfill"
     \medskip % create some *vertical* separation between the graphs
     \begin{subfigure}{.475\linewidth}
@@ -140,7 +140,7 @@ flattened out a lot.}%
   \includegraphics[width=\textwidth]{step-4-folding}
   \caption*{Step 4: The process of folding a batard.  Note how the rectangle
   is first glued together and then rolled inwards to create a dough roll.
-  Utimately the edges are sealed to create a more uniform dough.}%
+  Ultimately the edges are sealed to create a more uniform dough.}%
 \end{figure*}
 \clearpage{}