Update Customizing-Application-Modules-Guide.md

I really think that this text needs a update. I read to much into the line "ABP CLI automates this process for you." and did not notice the the other packages that were in the projects and also just looked into the project that it added packages and attributes. It may be silly but I didn´t think about the other projects and that I had to remove every nuget package...

See my support ticket https://support.abp.io/QA/Questions/1502/Error-running-up-Separate-IdentityServer-after-adding-Account-module-source-code

docs/en/Customizing-Application-Modules-Guide.md

@@ -31,7 +31,8 @@ If you don't think to make huge changes on the pre-built modules, re-using them
 
 If you want to make **huge changes** or add **major features** on a pre-built module, but the available extension points are not enough, you can consider to directly work the source code of the depended module.
 
-In this case, you typically **add the source code** of the module to your solution and **replace package references** by local project references. **[ABP CLI](CLI.md)** automates this process for you.
+In this case, you typically **add the source code** of the module to your solution and replace **every** package reference in the solution with its corresponding local project references.  **[ABP CLI](CLI.md)**  automates this process for you.
+
 
 #### Separating the Module Solution