:nth can be Callable

Author: gfldex

doc/Type/Str.pod6

@@ -581,14 +581,14 @@ The following adverbs are supported
 
 =begin table
 
-    short       long        meaning
-    =====       ====        =======
-    :g          :global     tries to match as often as possible
-    :nth(Int)               only substitute the nth's match
-    :ss         :samespace  preserves whitespace on substitution
-    :ii         :samecase   preserves case on substitution
-    :mm         :samemark   preserves character marks (e.g. 'ü' replaces with 'o' will result in 'ö')
-    :x(Int)                 substitute exactly $x matches
+    short              long        meaning
+    =====              ====        =======
+    :g                 :global     tries to match as often as possible
+    :nth(Int|Callable)             only substitute the nth's match
+    :ss                :samespace  preserves whitespace on substitution
+    :ii                :samecase   preserves case on substitution
+    :mm                :samemark   preserves character marks (e.g. 'ü' replaces with 'o' will result in 'ö')
+    :x(Int|Callable)               substitute exactly $x matches
 
 =end table