Fixed some xt errors

doc/Type/Attribute.pod6

@@ -67,12 +67,14 @@ compiler 2018.08+):
 
 You can specify a reason why the attribute is required:
 
-    class D {
-        has $.a is required("it is a good idea");
-    }
-    my $d = D.new;
-    CATCH{ default { say .^name, ': ', .Str } }
-    # OUTPUT: «X::Attribute::Required: The attribute '$!a' is required because it is a good idea,␤but you did not provide a value for it.␤»
+=begin code :skip-test<NYI>
+class D {
+    has $.a is required("it is a good idea");
+}
+my $d = D.new;
+CATCH{ default { say .^name, ': ', .Str } }
+# OUTPUT: «X::Attribute::Required: The attribute '$!a' is required because it is a good idea,␤but you did not provide a value for it.␤»
+=end code
 
 =head2 X<trait is DEPRECATED|trait,is DEPRECATED (Attribute)>
 

doc/Type/Str.pod6

@@ -123,8 +123,7 @@ currently erroneously returns the number of codepoints instead.
 
 =head2 method encode
 
-    multi method encode(Str:D $encoding = 'utf8', :$replacement,
-                        Bool() :$translate-nl = False, :$strict)
+    multi method encode(Str:D $encoding = 'utf8', :$replacement, Bool() :$translate-nl = False, :$strict)
 
 Returns a L<Blob> which represents the original string in the given encoding and
 normal form. The actual return type is as specific as possible, so

htmlify.p6

@@ -75,7 +75,7 @@ my %*POD2HTML-CALLBACKS;
 my %p5to6-functions;
 
 # TODO: Generate menulist automatically
-my @menu; # for use by future menu autogen 
+my @menu; # for use by future menu autogen
 @menu =
     ('language',''          ) => (),
     ('type', 'Types'        ) => <basic composite domain-specific exceptions>,