Update the code format (#50)

Author: renetapopova

modules/ROOT/pages/errors/all-errors.adoc

@@ -4,7 +4,7 @@
 [[neo4j-errors]]
 = List of all error codes
 
-This page contains lists of all neo4j errors, grouped by classification.
+This page contains lists of all neo4j errors, grouped by class.
 
 == Client errors
 

modules/ROOT/pages/errors/index.adoc

@@ -4,18 +4,7 @@
 = Error codes
 
 Error codes are returned by the server when the execution of a query fails.
-Error codes have severity `ERROR`.
-
-// [[error-format]]
-// == Error code fields
-
-// The error code format is as follows:
-
-
-[[error-types]]
-== Types of error codes
-
-All errors returned are classified into one of the following categories:
+They all have severity level `ERROR` and are grouped into one of the following classes:
 
 Client errors::
     These errors are caused by the client and are usually related to the request itself.

modules/ROOT/pages/index.adoc

@@ -11,7 +11,7 @@ Each status code follows the same format:
 
 [source, status code format, role="noheader"]
 -----
-Neo.[Classification].[Category].[Title]
+Neo.[Class].[Subclass].[Name]
 -----
 
 == Classification
@@ -24,7 +24,7 @@ The classification of the status code determines the effect on the transaction.
 [options="header", cols="<1m,<2,<1"]
 |===
 
-| Classification
+| Class
 | Description
 | Effect on the transaction 
 

modules/ROOT/pages/notifications/index.adoc

@@ -11,7 +11,7 @@ Contrary to error messages, notifications are only returned if the execution of
 
 The notification object, which is part of the result summary, consists of the following fields:
 
-* *Code* -- The status code in the form of `Neo.ClientNotification.[Category].[Title]`.
+* *Code* -- The status code in the form of `Neo.ClientNotification.[Subclass].[Name]`.
 * *Title* -- The description of the status code.
 * *Description* -- The description of a specific notification, which can contain details about the query being executed.
 * *Severity* -- The severity can be one of the following: +