Fix unterminated string literal

Author: taldcroft

help.html

@@ -26,7 +26,7 @@
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-		<a href="index.html"><img src="images/astropy_word.svg" height="32" onerror="this.src='images/astropy_word_32.png; this.onerror=null;"/></a>
+		<a href="index.html"><img src="images/astropy_word.svg" height="32" onerror="this.src='images/astropy_word_32.png'; this.onerror=null;"/></a>
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