Documentation for member @bin comes out like

    list of io request counts corresponding to histogram intervals.
    len("bins") = len("boundaries") + 1 For the example above, "bins"
    may be something like [3, 1, 5, 2], and corresponding histogram
    looks like:

Note how the equation and the sentence following it run together.
Replace the equation:

    list of io request counts corresponding to histogram intervals,
    same number of elements as "boundaries".  For the example above,
    "bins" may be something like [3, 1, 5, 2], and corresponding
    histogram looks like:

Cc: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 qapi/block-core.json | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index 5dd5f7e4b0..6ca448b6e6 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -652,10 +652,9 @@
 #     10), [10, 50), [50, 100), [100, +inf).
 #
 # @bins: list of io request counts corresponding to histogram
-#     intervals.
-#     len(@bins) = len(@boundaries) + 1
-#     For the example above, @bins may be something like [3, 1, 5, 2],
-#     and corresponding histogram looks like:
+#     intervals, same number of elements as @boundaries.  For the
+#     example above, @bins may be something like [3, 1, 5, 2], and
+#     corresponding histogram looks like:
 #
 # ::
 #
-- 
2.41.0