doc: use "it returns XXX" style instead of "XXX is returned"

Because documentation of Ruby uses "it returns XXX" style.
groonga · Jun 12, 2013 · ab19728 · ab19728
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diff --git a/doc/source/reference/functions/query.txt b/doc/source/reference/functions/query.txt
@@ -157,9 +157,9 @@ See :ref:`query-expander` about details.
 Return value
 ------------
 
-``query`` returns whether any record is matched or not. If one or
-more records are matched, ``true`` is returned. Otherwise, ``false``
-is returned.
+``query`` returns whether any record is matched or not. If one or more
+records are matched, it returns ``true``. Otherwise, it returns
+``false``.
 
 TODO
 ----

diff --git a/doc/source/reference/functions/sub_filter.txt b/doc/source/reference/functions/sub_filter.txt
@@ -123,8 +123,8 @@ Return value
 ------------
 
 ``sub_filter`` returns whether any record is matched or not. If one or
-more records are matched, ``true`` is returned. Otherwise, ``false``
-is returned.
+more records are matched, it returns ``true``. Otherwise, it returns
+``false``.
 
 See also
 --------