Update xml/issue4418.xml

Co-authored-by: Jonathan Wakely <[email protected]>

Author: tomaszkam

xml/issue4418.xml

@@ -69,8 +69,8 @@ std::generator<std::vector<int>> g()
 } 	
 </pre></blockquote>
 <p>
-The constrains are equivalent to checking if `yield_value(*it)` is well-formed,
-and maybe we could express is directly as.
+The constraints are equivalent to checking if `yield_value(*it)` is well-formed,
+and maybe we could express is directly as:
 </p>
 <blockquote><pre>
 requires requires (promise_type p, ranges::iterator_t&lt;R&gt; it) {