Make the documentation comment for the module clearer

avpaderno → changed the visibility of the branch 3466885-typo-in-docblock to hidden.

Actually, there are more sentences that need to be changed.

Drupal 7's hook_menu() is now Routing system in Drupal 8.

Drupal 8's routing system is based on Symfony's routing system.

There is no need to use two different sentences.

A route is an entry Drupal 8's router table which contains a path attached to it.

If it contains a path, the path is attached to it.

I am not sure that A route is an entry [in] the Drupal 8's router table which contains a path. makes clear what a route is. I would use a different sentence. I am sure the Drupal documentation describes differently a route.

When a path is requested, Drupal matches the request to a route and if route is match the content is returned else 404 is returned.

That sentence seem to say something obvious. If then the focus is the differences between Drupal 7 and Drupal 8, that sentence should be removed, since that is not a difference between Drupal 7 and Drupal 8.
Drupal 7's hook_menu() is now Routing system in Drupal 8. should probably be removed. The rest of the documentation comment should focus on describing what routes are on Drupal 8+.

The association of a path with a controller, coupled with parameter upcasting and access checking is now handled in the routing system.

Since Drupal 7 does not have controllers, that sentence cannot say that the association of a path with a controller is now handled in the routing system.

Drupal loads the routing file that is of the form module_name.routing.yml that it will use to define how Drupal will behave when a specific path is encountered.

The only new information given in that sentence is that routes are defined in .routing.yml files.
I do not feel that that is of the form module.routing.yml is a way to say whose filename is <module_name>.routing.yml, where <module_name> is the module machine name.

If you want to expose content or functionality on your own URIs on a site, routing file is an important part of your module. This can help provide functionality at specific URIs of a website or just modify or augment existing functionality.

These sentences are not giving new information. The previous sentence already made clear that a .routing.yml file is necessary to define new routes.
The new information is eventually that a routing file is an important part of a module, but that is not always true: There are module that do not define new routes.
A routing file is important for a module that defines new routes, but since it was already stated that routes are defined in routing files, there is no need to say they are important for a module.