cheat sheet: Use -G instead of -S

Author: jvns

content/cheat-sheet/_index.html

@@ -273,7 +273,7 @@ <h3>Show every commit that modified a file, including before it was renamed:</h3
     </div>
     <div class="item">
       <h3>Find every commit that added or removed some text:</h3>
-      <code>git log -S banana</code>
+      <code>git log -G banana</code>
     </div>
     <div class="item">
       <h3>Show who last changed each line of a file:</h3>