Document that default combination method is RRF

Author: vishal-bala

redisvl/query/hybrid.py

@@ -109,9 +109,10 @@ def __init__(
                 accuracy of the search.
             yield_vsim_score_as: The name of the field to yield the vector similarity score as.
             vector_filter_expression: The filter expression to use for the vector similarity search. Defaults to None.
-            combination_method: The combination method to use. Options are {RRF, LINEAR}. Defaults to None. If "RRF" is
-                specified, then at least one of `rrf_window` or `rrf_constant` must be provided. If "LINEAR" is
-                specified, then at least one of `linear_alpha` or `linear_beta` must be provided.
+            combination_method: The combination method to use. Options are {RRF, LINEAR}. If not specified, the server
+                defaults to RRF. If "RRF" is specified, then at least one of `rrf_window` or `rrf_constant` must be
+                provided. If "LINEAR" is specified, then at least one of `linear_alpha` or `linear_beta` must be
+                provided.
             rrf_window: The window size to use for the reciprocal rank fusion (RRF) combination method. Limits
                 fusion scope.
             rrf_constant: The constant to use for the reciprocal rank fusion (RRF) combination method. Controls decay