Unconfuse packages and compilation units

cfa++ for reporting.

Author: jnthn

doc/Language/syntax.pod6

@@ -611,8 +611,8 @@ You can also assign subroutines to variables.
 
 =head3 X<Module, Class, Role, and Grammar declaration|declarator,unit;declarator,module>
 
-There are several types of compilation units (packages), each declared with a
-keyword, a name, some optional traits, and a body of functions.
+There are several types of package, each declared with a keyword, a name, some optional traits, and a
+body of subroutines, methods, or rules.
 
     module Gar { }
 
@@ -622,7 +622,9 @@ keyword, a name, some optional traits, and a body of functions.
 
     grammar Baz { }
 
-You can declare a C<unit> of things without explicit curly brackets.
+You can declare a C<unit> package without explicit curly brackets. This must be at the start of the
+file (preceded only by comments or C<use> statements), and the rest of the file will be taken as
+being the body of the package.
 
     =begin code :skip-test
     unit module Gar;