avoid trailing comma before closing paren

where not needed.

doc/Language/classtut.pod6

@@ -10,7 +10,7 @@ X<|OOP>
 
 Perl 6 has a rich built in syntax for the definition and use of classes
 for object oriented programming, allowing for the definition of state
-(as L<attributes|#State>,) and behaviour (as L<methods|#Methods>,)
+(as L<attributes|#State>) and behaviour (as L<methods|#Methods>)
 in the objects of a class.
 
 A simple class is provided with a default constructor, that allows the

doc/Language/concurrency.pod6

@@ -198,7 +198,7 @@ otherwise.
 
 If you are creating a promise that you intend to keep or break yourself
 then you probably don't want any code that might receive the promise to
-inadvertently (or otherwise,) keep or break the promise before you do.
+inadvertently (or otherwise) keep or break the promise before you do.
 For this purpose there is the L<method vow|/type/Promise#method_vow>, which
 returns a L<Vow> object which becomes the only mechanism by which the promise
 can be kept or broken.  If an attempt to keep or break the Promise is made
@@ -485,7 +485,7 @@ channel must be checked to determine whether it is closed:
     # Doing some unrelated things...
 
 The L<method closed|/type/Channel#method_closed> returns a L<Promise> that
-will be kept (and consequently will evaluate to True in a boolean context,)
+will be kept (and consequently will evaluate to True in a boolean context)
 when the channel is closed.
 
 The C<.poll> method can be used in combination with C<.receive> method, as a
@@ -727,12 +727,12 @@ The class L<Lock> provides the low level mechanism that protects
 shared data in a concurrent environment and is thus key to supporting
 thread-safety in the high level API, this is sometimes known as a
 "Mutex" in other programming languages.  Because the higher level classes
-(L<Promise>, L<Supply> and L<Channel>,) use a L<Lock> where required it
+(L<Promise>, L<Supply> and L<Channel>) use a L<Lock> where required it
 is unlikely that user code will need to use a L<Lock> directly.
 
 The primary interface to L<Lock> is the method
 L<protect|/type/Lock#method_protect> which ensures that a block of code
-(commonly called a "critical section",) is only executed in one thread
+(commonly called a "critical section") is only executed in one thread
 at a time:
 
     my $lock = Lock.new;

doc/Type/IO/Handle.pod6

@@ -252,7 +252,7 @@ characters.
      method seek(IO::Handle:D: Int:D $offset, SeekType:D $whence --> True)
 
 Move the file pointer (that is, the position at which any subsequent read
-or write operations will begin,) to the byte position specified by
+or write operations will begin) to the byte position specified by
 C<$offset> relative to the location specified by C<$whence> which may be
 one of:
 

doc/Type/IO/Path.pod6

@@ -446,7 +446,7 @@ physical storage device).
     sub    symlink(Str $target, Str $name --> Bool)
 
 Create a new symbolic link named as $target (or the name of the invocant in
-the method form,) to the existing file named C<$name>.
+the method form) to the existing file named C<$name>.
 
 Both forms will return C<True> on success or L<fail|/routine/fail> with
 L<X::IO::Symlink> if the symbolic link could not be created.
@@ -457,7 +457,7 @@ L<X::IO::Symlink> if the symbolic link could not be created.
     sub    link(Str $target, Str $name --> Bool)
 
 Create a new link named as $target (or the name of the invocant in the
-method form,) to the existing file named C<$name>.
+method form) to the existing file named C<$name>.
 
 Both forms will return C<True> on success or L<fail|/routine/fail> with
 L<X::IO::Link> if the link operation could not be performed.

doc/Type/IO/Socket/Async.pod6

@@ -72,8 +72,8 @@ await $socket.print-to('localhost', 3333, "Hello, Perl 6!");
 =head1 Methods
 
 The L<IO::Socket::Async> cannot be constructed directly, either C<connect>
-or C<listen> (for TCP connections, ) or C<udp> or C<bind-udp> (for UDP
-data,) should be used to create a client or a server respectively.
+or C<listen> (for TCP connections) or C<udp> or C<bind-udp> (for UDP
+data) should be used to create a client or a server respectively.
 
 =head2 method connect