fix: add </root> to circle.xml, square.xml

Author: jeremydouglass

Reference/api_en/circle.xml

@@ -40,3 +40,5 @@ circle(<c>a</c>, <c>b</c>, <c>extent</c>)
 
 <related>ellipse</related>
 <related>ellipseMode</related>
+
+</root>

Reference/api_en/square.xml

@@ -40,3 +40,5 @@ square(<c>a</c>, <c>b</c>, <c>extent</c>)
 
 <related>rect</related>
 <related>rectMode</related>
+
+</root>