minor #1641 [Doc] Tweaks and fixes for UX Icons docs (javiereguiluz)

This PR was merged into the 2.x branch.

Discussion
----------

[Doc] Tweaks and fixes for UX Icons docs

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Issues        | -
| License       | MIT

I think we should mention some of the popular icon sets so people googling for them and Symfony can find this page. Also, let's show the config file path in the config example. I'm not sure if we want that file path to be `config/packages/ux_icons.yaml`

In #1602 we're making more changes to docs, so, if this PR is merged, I think it should be merged before #1602. Thanks!

Commits
-------

e3ac0a2 [Doc] Tweaks and fixes for UX Icons docs

Author: kbond

src/Icons/doc/index.rst

@@ -1,8 +1,10 @@
 Symfony UX Icons
 ================
 
-Renders local and remote SVG icons in your Twig templates. It also gives direct
-access to over 200,000 open source vector icons from tens of icon sets.
+This package provides utilities to work with SVG icons. It renders both local
+and remote icons in your Twig templates. It provides direct access to over
+200,000 open source vector icons from popular icon sets such as FontAwesome,
+Bootstrap Icons, Tabler Icons, Google Material Design Icons, etc.
 
 Installation
 ------------
@@ -114,7 +116,7 @@ the ``assets/icons/`` directory. You can think of importing an icon as *locking
 .. code-block:: terminal
 
     # icon will be saved in `assets/icons/flowbite/user-solid.svg` and you can
-    # use it name with the name: `flowbite:user-solid`
+    # use it with the name: `flowbite:user-solid`
     $ php bin/console ux:icons:import flowbite:user-solid
 
     # it's also possible to import several icons at once
@@ -168,6 +170,7 @@ Full Default Configuration
 
 .. code-block:: yaml
 
+    # config/packages/ux_icons.yaml
     ux_icons:
         # The local directory where icons are stored.
         icon_dir: '%kernel.project_dir%/assets/icons'