update pod info for current capability

remove “key => ...” formats which are not yet implemented

doc/Language/pod.pod6

@@ -46,13 +46,13 @@ different ways by different types of blocks, but is always specified using
 Perl6-ish option pairs. That is, any of:
 
 =begin table
- Value is...       Specify with...       Or with...       Or with...
- ===============   ===================   ==============   ======================
- Boolean (true)    :key                  :key(1)          key => 1
- Boolean (false)   :!key                 :key(0)          key => 0
- String            :key<str>             :key('str')      key => 'str'
- List              :key<1 2 3>           :key[1,2,3]      key => [1,2,3]
- Hash              :key{a=>1, b=>2}                       key => {a=>1, b=>2}
+ Value is...       Specify with...       Or with...
+ ===============   ===================   ==============
+ Boolean (true)    :key                  :key(1)
+ Boolean (false)   :!key                 :key(0)
+ String            :key<str>             :key('str')
+ List              :key<1 2 3>           :key[1,2,3]
+ Hash              :key{a=>1, b=>2}
 =end table
 
 All option keys and values must, of course, be constants since Pod is a
@@ -62,7 +62,9 @@ Perl 6 pair notations.
 
 The configuration section may be extended over subsequent lines by
 starting those lines with an C<=> in the first (virtual) column followed
-by a whitespace character.
+by a whitespace character. (NOTE: This feature is not yet implemented.
+All configuration information currently must be provided on the same
+line as the C<=begin> marker line.
 
 =head2 Paragraph blocks