Minor bug-fixes in docs version 2.2 specific (#939)

* Fix gh-893 (v.2.2 specific) feedback: Submodule box.info

This is the same fix as with v. 1.10 but with added downstream.idle description.
Translation needed

* Update gh-893 feedback: Submodule box.info

Updated the example to represent features, relevant to version 2.2

* Fix gh-899 feedback: Module key_def

Added round brackets and pretify the text description.
Translation needed for this page.

Author: v-izmalkov

doc/2.2/book/box/box_info.rst

@@ -182,9 +182,16 @@ variables.
       Even if an instance is :ref:`removed <replication-remove_instances>`,
       its values will still appear here.
 
-    * **replication.downstream.status** ``= disconnected`` is displayed if the
-      downstream instance disconnects from the upstream instance. Otherwise the
-      status is not reported.
+    * **replication.downstream.idle** is the time (in seconds) since the last
+      time this instance sent events through the downstream replication.
+
+    * **replication.downstream.status** is the replication status for downstream
+      replications:
+
+      * ``stopped`` means that downstream replication has stopped.
+      * ``follow`` means that downstream replication is in progress.
+
+
 
 .. function:: box.info()
 
@@ -205,33 +212,37 @@ variables.
 
         tarantool> box.info()
         ---
-        - version: 1.7.6-68-g51fcffb77
+        - vinyl: []
+          version: 2.2.0-482-g8c84932ad
           id: 2
           ro: true
-          vclock: {1: 5}
-          uptime: 917
+          status: running
+          vclock: {1: 9}
+          uptime: 356
           lsn: 0
-          vinyl: []
+          memory: []
           cluster:
-            uuid: 783e2285-55b1-42d4-b93c-68dcbb7a8c18
-          pid: 35341
-          status: running
-          signature: 5
+            uuid: e261a5bc-6303-4de3-9873-556f311255e0
+          pid: 160
+          gc: []
+          signature: 9
           replication:
             1:
               id: 1
-              uuid: 471cd36e-cb2e-4447-ac66-2d28e9dd3b67
-              lsn: 5
+              uuid: fce71bb3-0e99-40ec-ab7e-5159487e18d1
+              lsn: 9
               upstream:
                 status: follow
-                idle: 124.98795700073
-                peer: replicator@192.168.0.101:3301
-                lag: 0
+                idle: 0.035709699994186
+                peer: replicator@127.0.0.1:3401
+                lag: 0.00016164779663086
               downstream:
-                vclock: {1: 5}
+                status: follow
+                idle: 0.59840899999836
+                vclock: {1: 9}
             2:
               id: 2
-              uuid: ac45d5d2-8a16-4520-ad5e-1abba6baba0a
+              uuid: bc4629ce-ea31-4f75-b805-a4807bcacc93
               lsn: 0
-          uuid: ac45d5d2-8a16-4520-ad5e-1abba6baba0a
+          uuid: bc4629ce-ea31-4f75-b805-a4807bcacc93
         ...

doc/2.2/reference/reference_lua/key_def.rst

@@ -23,8 +23,8 @@ to extract or compare the index key values.
 
     :returns: key_def-object :ref:`a key_def object <key_def-object>`
 
-    The parts table has components which are the same as 
-    the ``parts`` option in 
+    The parts table has components which are the same as
+    the ``parts`` option in
     :ref:`Options for space_object:create_index() <box_space-create_index-options>`.
 
     fieldno (integer) for example fieldno=1
@@ -197,12 +197,14 @@ to extract or compare the index key values.
 
     .. _key_def-totable:
 
-    .. method:: totable
+    .. method:: totable()
 
         Return a table containing what is in the key_def_object.
-        This is the reverse of ``key_def.new()`` -- ``key_def.new()`` takes
-        a table and returns a key_def object, ``key_def_object:totable()`` takes
-        a key_def object and returns a table.
+        This is the reverse of ``key_def.new()``:
+
+        *  ``key_def.new()`` takes a table and returns a key_def object,
+        *  ``key_def_object:totable()`` takes a key_def object and returns a table.
+
         This is useful for input to ``_serialize`` methods.
 
         :return: table