Docs: Added more methods for interactive parser

docs/classes.rst

@@ -70,10 +70,10 @@ InteractiveParser
 -----------------
 
 .. autoclass:: lark.parsers.lalr_interactive_parser.InteractiveParser
-    :members: choices, feed_token, copy, pretty, resume_parse, exhaust_lexer, accepts
+    :members: choices, feed_token, copy, pretty, resume_parse, exhaust_lexer, accepts, as_immutable
 
 .. autoclass:: lark.parsers.lalr_interactive_parser.ImmutableInteractiveParser
-    :members: choices, feed_token, copy, pretty, resume_parse, exhaust_lexer, accepts
+    :members: choices, feed_token, copy, pretty, resume_parse, exhaust_lexer, accepts, as_mutable
 
 
 ast_utils