Add (missing) whitespaces

... or else the spell test (xt/aspell.t) fails

Author: stoned

doc/Language/101-basics.pod6

@@ -439,7 +439,7 @@ say "{%sets}␤";
 
 When array and hash variables appear directly in a double-quoted string (and
 not inside curly braces), they are only interpolated if their name is
-followed by a postcircumfix operatorE<mdash>a bracketing pair that follows a
+followed by a postcircumfix operator E<mdash> a bracketing pair that follows a
 statement. It's also ok to have a method call between the variable name and
 the postcircumfix.