Update sql tutorials

Author: xuniq

doc/code_snippets/snippets/config/instances.enabled/mysql/config.yaml

@@ -0,0 +1,11 @@
+app:
+  file: 'example.lua'
+
+groups:
+  group001:
+    replicasets:
+      replicaset001:
+        instances:
+          instance001:
+            iproto:
+              listen: "3301"

doc/code_snippets/snippets/config/instances.enabled/mysql/example.lua

@@ -0,0 +1,17 @@
+-- example.lua --
+
+box.schema.user.grant('guest', 'read,write,execute', 'universe')
+
+local function bootstrap()
+    if not box.space.mysqldaemon then
+        s = box.schema.space.create('mysqldaemon')
+        s:create_index('primary',
+                { type = 'tree', parts = { 1, 'unsigned' }, if_not_exists = true })
+    end
+    if not box.space.mysqldata then
+        t = box.schema.space.create('mysqldata')
+        t:create_index('primary',
+                { type = 'tree', parts = { 1, 'unsigned' }, if_not_exists = true })
+    end
+end
+bootstrap()

doc/code_snippets/snippets/config/instances.enabled/mysql/instances.yml

@@ -0,0 +1 @@
+instance001:

doc/contributing/docs/markup/code.rst

@@ -56,9 +56,9 @@ For code snippets, we use the ``code-block:: language``
 You can enable syntax highlighting if you specify the language for the snippet.
 The most commonly used highlighting languages are:
 
-*   ``tarantoolsession``—interactive Tarantool session,
+*   ``tarantoolsession`` -- interactive Tarantool session,
     where command lines start with ``tarantool>`` prompt.
-*   ``console``—interactive console session, where command lines
+*   ``console`` -- interactive console session, where command lines
     start with ``$`` or ``#``.
 *   ``lua``, ``bash`` or ``c`` for programming languages.
 *   ``text`` for cases when we want the code block to have no highlighting.