documentation linting fix

Author: MarioRadu

README.md

@@ -90,7 +90,7 @@ More details on how fixtures work can be found here: https://github.com/dotkerne
 
     php -S 0.0.0.0:8080 -t public
 
-Sending a GET request to the [home page](http://localhost:8080/) should output the following message:
+Sending a GET request to the [home page](http://0.0.0.0:8080/) should output the following message:
 
     {
     "message": "Welcome to DotKernel API!"

docs/book/v4/introduction/installation.md

@@ -66,7 +66,7 @@ More details on how fixtures work can be found here: https://github.com/dotkerne
 
     php -S 0.0.0.0:8080 -t public
 
-Sending a GET request to the [home page](http://localhost:8080/) should output the following message:
+Sending a GET request to the [home page](http://0.0.0.0:8080/) should output the following message:
 
     {
       "message": "Welcome to DotKernel API!"

docs/book/v4/tutorials/create-book-module.md

@@ -595,7 +595,7 @@ To execute the migrations run:
 
 ## Checking endpoints
 
-If we did everything as planned we can call the `http://localhost/books` endpoint and create a new book:
+If we did everything as planned we can call the `http://0.0.0.0:8080/books` endpoint and create a new book:
 
     curl -X POST http://0.0.0.0:8080/book
       -H "Content-Type: application/json"

documentation/README.md

@@ -17,7 +17,7 @@ At this point, we assume you already have Postman installed. The following steps
 You should see a new collection (`DotKernel_API`) added to your collection list, containing the documentation of all DotKernel API endpoints.
 
 Also, you should see a new environment (`DotKernel_API`) added to your environments.
-This contains a variable, called `APPLICATION_URL` set to `http://localhost:8080`.
+This contains a variable, called `APPLICATION_URL` set to `http://0.0.0.0:8080`.
 If your application runs on a different URL/port, modify this variable accordingly.
 
 ## Usage