Fix typo

book/history/sourdough-history.tex

@@ -204,7 +204,7 @@ \chapter{The history of sourdough}%
 yeast microorganisms are the reason for alcoholic fermentation
 and not other chemical catalysts. He continued with his research and
 was the first person to isolate and grow pure yeast strains.
-Soon later in \num{1868} in the Fleischmann brothers Charles
+Soon later in \num{1868} the Fleischmann brothers Charles
 and Maximilian were the first to patent pure yeast strains
 for bread making. The yeasts offered
 were isolated from batches of sourdough. By \num{1879} the machinery was built