Update code comments in ainsert method

Update code comments in ainsert method. The original comment was cut off in the middle, not a complete sentence, and cannot be read

lightrag/lightrag.py

@@ -553,6 +553,7 @@ class LightRAG:
         Args:
             input: Single document string or list of document strings
             split_by_character: if split_by_character is not None, split the string by character, if chunk longer than
+            chunk_token_size, it will be split again by token size.
             split_by_character_only: if split_by_character_only is True, split the string by character only, when
             split_by_character is None, this parameter is ignored.
             ids: single string of the document ID or list of unique document IDs, if not provided, MD5 hash IDs will be generated
@@ -574,6 +575,7 @@ class LightRAG:
         Args:
             input: Single document string or list of document strings
             split_by_character: if split_by_character is not None, split the string by character, if chunk longer than
+            chunk_token_size, it will be split again by token size.
             split_by_character_only: if split_by_character_only is True, split the string by character only, when
             split_by_character is None, this parameter is ignored.
             ids: list of unique document IDs, if not provided, MD5 hash IDs will be generated