[DOCS] Clarify scoring for multi_match phrase type
The original statement "Runs a match_phrase query on each field and combines the _score from each field." for the phrase type is a but misleading. The phrase type behaves like the best_fields type and does not combine the scores of each fields.
@@ -83,8 +83,8 @@ parameter, which can be set to:
were one big field. Looks for each word in *any*
field. See <<type-cross-fields>>.
-`phrase`:: Runs a `match_phrase` query on each field and combines
- the `_score` from each field. See <<type-phrase>>.
+`phrase`:: Runs a `match_phrase` query on each field and uses the `_score`
+ from the best field. See <<type-phrase>>.
`phrase_prefix`:: Runs a `match_phrase_prefix` query on each field and
combines the `_score` from each field. See <<type-phrase>>.
