clarify phrasing

doc/Language/functions.pod6

@@ -857,7 +857,7 @@ and its signature is the means by which command line arguments can be
 parsed. Multi methods are supported and a usage method is automatically
 generated and displayed if no command line arguments are provided. All command
 line arguments are also available in
-L<C<@*ARGS>|/language/variables#Dynamic_variables>, it can be mutated before
+L<C<@*ARGS>|/language/variables#Dynamic_variables>, which can be mutated before
 being processed by C<MAIN>.
 
 The return value of C<MAIN> is ignored. To provide an exitcode other then 0,
@@ -908,8 +908,8 @@ positional parameter. For example, the above program can be called with:
 X<|USAGE>
 
 If no multi candidate of C<MAIN> is found for the given command line
-parameters, the sub C<USAGE> is called. If no such method is found, output a
-generated usage message.
+parameters, the sub C<USAGE> is called. If no such method is found,
+the compiler will output a generated usage message.
 
     sub MAIN(Int $i){ say $i == 42 ?? 'answer' !! 'dunno' }