Update appendix_a_hand_rolled_parser.html

Author: orangeduck

appendix_a_hand_rolled_parser.html

@@ -256,7 +256,7 @@ <h2 id="reading_symbols">Reading Symbols</h2> <hr/>
 
 <h2 id="reading_strings">Reading Strings</h2> <hr/>
 
-<p>When we read in strings things get a little more complicated. This is because of <em>escaping</em>. We're covered this a little in earlier chapters but now we're going to have to deal with it head on.</p>
+<p>When we read in strings things get a little more complicated. This is because of <em>escaping</em>. We've covered this a little in earlier chapters but now we're going to have to deal with it head on.</p>
 
 <p>Escaping is the name we give to the way we let users enter special characters by using special combinations of symbols starting with a backslash <code>\</code>. For example the most famous of these is the newline character which we encode using <code>\n</code>. When converting from the multi-character representation to the real representation we call this <em>unescaping</em> and when converting from the real representation to the two character encoding we call this <em>escaping</em>.</p>