fix readme syntax

readme.md

@@ -177,7 +177,7 @@ will have the Value() of "Far & Away" when queried from the XMLText object,
 and will be written back to the XML stream/file as an ampersand. 
 
 Additionally, any character can be specified by its Unicode code point:
-The syntax " " or " " are both to the non-breaking space characher. 
+The syntax ` ` or ` ` are both to the non-breaking space character. 
 This is called a 'numeric character reference'. Any numeric character reference
 that isn't one of the special entities above, will be read, but written as a
 regular code point. The output is correct, but the entity syntax isn't preserved.