renaming table back to "callframe methods" because its about them and if you want rename it, fix backlinks from A too

Author: lichtkind

docs/appendix-b-grouped.txt

@@ -1064,7 +1064,7 @@ In routine and block definitions can be also some character with special meaning
 [`^`](appendix-a-index.html#caret-signature)                   prefix of metaclass methods, `$obj.^methods();` is shortcut for [`$obj.HOW.methods($obj);`](#object-introspection)
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-### Callframes ###
+### Callframe Methods ###
 
 A callframe object is generated at run-time for each call of a block of code.
 If a block of code includes a [**callframe()**](appendix-a-index.html#callframe) call,