Corrections in Capture doc (#598)

* Change delimiters on formatted code

* Parenthesize single numeric value

example code generates warnings of potential difficulties

* Update Capture.pod

doc/Type/Capture.pod

@@ -15,9 +15,9 @@ When you call C<print $a, $b>, the C<$a, $b> part is a Capture.
 Captures contain a list-like part for positional arguments and a hash-like
 part for named arguments.  For the named arguments, Captures use a slightly
 different I<syntax> than a normal List.  There are two easy ways to make a
-named argument: 1) use an unquoted key naming a parameter, followed by C<'=>'>,
-followed by the argument and 2) use a colon-pair literal named after the
-parameter:
+named argument: 1) use an unquoted key naming a parameter, followed by
+C«=>», followed by the argument and 2) use a colon-pair literal named
+after the parameter:
 
     say unique 1, -2, 2, 3, as => { abs $_ }; # 1, -2, 3
     # ... is the same thing as:
@@ -31,7 +31,7 @@ Commonly, this term will be a List of terms, from which any Pair
 literal will be placed in the named part, and all other terms will be
 placed in the positional part.
 
-    my $c = \42;            # Capture with one positional parts
+    my $c = \(42);            # Capture with one positional parts
     $c = \(1, 2, a => 'b'); # Capture with two positional and one named part
 
 To use such a Capture, you may use C<'|'> before it in a function call, and it