fix compilation issues

doc/Language/subscripts.pod6

@@ -854,10 +854,11 @@ of an object of this type.
 =comment When modifying this section, please also adapt the STORE
          section in Associative accordingly as they are very similar.
 
-    method STORE (::?CLASS:D: values, :$initialize)
+    method STORE (::?CLASS:D: \values, :$initialize)
 
 This method should only be supplied if you want to support the:
 
+=for code :preamble<role Foo {}>
     my @a is Foo = 1,2,3;
 
 syntax for binding your implementation of the C<Positional> role.
@@ -980,10 +981,11 @@ slot of an object of this type.
 =comment When modifying this section, please also adapt the STORE
          section in Positional accordingly as they are very similar.
 
-    method STORE (::?CLASS:D: values, :$initialize)
+    method STORE (::?CLASS:D: \values, :$initialize)
 
 This method should only be supplied if you want to support the:
 
+=for code :preamble<role Foo {}>
     my %h is Foo = a => 42, b => 666;
 
 syntax for binding your implementation of the C<Associative> role.

doc/Type/Associative.pod6

@@ -70,22 +70,23 @@ you use the parametrized version of Associative.
 
 =head2 method AT-KEY
 
-    method AT-KEY(key)
+    method AT-KEY(\key)
 
 Should return the value / container at the given key.
 
 =head2 method EXISTS-KEY
 
-    method EXISTS-KEY(key)
+    method EXISTS-KEY(\key)
 
 Should return a C<Bool> indicating whether the given key actually has a value.
 
 =head2 method STORE
 
-    method STORE(values, :$initialize)
+    method STORE(\values, :$initialize)
 
 This method should only be supplied if you want to support the:
 
+=for code :preamble<role Foo {}>
     my %h is Foo = a => 42, b => 666;
 
 syntax for binding your implementation of the C<Associative> role.

doc/Type/Positional.pod6

@@ -29,23 +29,24 @@ Should return the number of available elements in the instantiated object.
 
 =head2 method AT-POS
 
-    method AT-POS(position)
+    method AT-POS(\position)
 
 Should return the value / container at the given position.
 
 =head2 method EXISTS-POS
 
-    method EXISTS-POS(position)
+    method EXISTS-POS(\position)
 
 Should return a C<Bool> indicating whether the given position actually has a
 value.
 
 =head2 method STORE
 
-    method STORE(values, :$initialize)
+    method STORE(\values, :$initialize)
 
 This method should only be supplied if you want to support the:
 
+=for code :preamble<role Foo {}>
     my @a is Foo = 1,2,3;
 
 syntax for binding your implementation of the C<Positional> role.