Update 3.nebula-cpp-client.md (#1357)

docs-2.0/14.client/3.nebula-cpp-client.md

@@ -2,11 +2,9 @@
 
 [Nebula CPP](https://github.com/vesoft-inc/nebula-cpp/tree/{{cpp.branch}}) is a C++ client for connecting to and managing the Nebula Graph database.
 
-## Prerequisites
+## Limitations
 
-- You have installed C++ and GCC 4.8 or later versions.
-
-- You have prepared the [correct resources](../4.deployment-and-installation/1.resource-preparations.md).
+You have installed C++ and GCC 4.8 or later versions.
 
 ## Compatibility with Nebula Graph
 
@@ -19,9 +17,18 @@
 
 ## Install Nebula CPP
 
+This document describes how to install Nebula CPP with the source code.
+
+### Prerequisites
+
+- You have prepared the [correct resources](../4.deployment-and-installation/1.resource-preparations.md).
+- You have installed C++ and GCC version is: {10.1.0 | 9.3.0 | 9.2.0 | 9.1.0 | 8.3.0 | 7.5.0 | 7.1.0}. For details, see [the gcc_preset_versions parameter](https://github.com/vesoft-inc/nebula-cpp/blob/{{cpp.tag}}/third-party/install-third-party.sh).
+
+### Steps
+
 1. Clone the Nebula CPP source code to the host.
 
-  - (Recommended) To install a specific version of Nebula CPP, use the Git option `--branch` to specify the branch. For example, to install v{{ cpp.release }}, run the following command:
+  - (Recommended) To install a specific version of Nebula CPP, use the Git option `--branch` to specify the branch. For example, to install {{ cpp.tag }}, run the following command:
 
     ```bash
     $ git clone --branch {{cpp.branch}} https://github.com/vesoft-inc/nebula-cpp.git
@@ -101,6 +108,6 @@ Compile the CPP file to an executable file, then you can use it. The following s
   $ LIBRARY_PATH=/usr/local/nebula/lib64:$LIBRARY_PATH g++ -std=c++11 SessionExample.cpp -I/usr/local/nebula/include -lnebula_graph_client -o session_example
   ```
 
-### Core of the example code
+## Core of the example code
 
 This sub-section shows the core of the example code. For all the code, see [SessionExample](https://github.com/vesoft-inc/nebula-cpp/blob/{{cpp.branch}}/examples/SessionExample.cpp).