minor symfony#2339 Update index.rst (LesRouxDominerontLeMonde)

This PR was merged into the 2.x branch.

Discussion
----------

Update index.rst

added '::' instead of ':' for visual effect

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Issues        |
 instead --> visual effect
| License       | MIT

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This will help reviewers and should be a good start for the documentation.

Additionally (see https://symfony.com/releases):
 - Always add tests and ensure they pass.
 - For new features, provide some code snippets to help understand usage.
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 - Changelog entry should follow https://symfony.com/doc/current/contributing/code/conventions.html#writing-a-changelog-entry
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--> added the '::' syntax instead of the simple ':' for more visual effect on the doc.

Commits
-------

64498a6 Update index.rst

Author: Kocal

src/Map/doc/index.rst

@@ -78,13 +78,12 @@ Start by creating a new map instance::
 Center and zoom
 ~~~~~~~~~~~~~~~
 
-You can set the center and zoom of the map using the ``center()`` and ``zoom()`` methods:
+You can set the center and zoom of the map using the ``center()`` and ``zoom()`` methods::
 
     use Symfony\UX\Map\Map;
     use Symfony\UX\Map\Point;
     
     $myMap
-    
         // Explicitly set the center and zoom
         ->center(new Point(46.903354, 1.888334))
         ->zoom(6)
@@ -96,7 +95,7 @@ You can set the center and zoom of the map using the ``center()`` and ``zoom()``
 Add markers
 ~~~~~~~~~~~
 
-You can add markers to a map using the ``addMarker()`` method:
+You can add markers to a map using the ``addMarker()`` method::
 
     $myMap
         ->addMarker(new Marker(
@@ -134,7 +133,7 @@ You can add markers to a map using the ``addMarker()`` method:
 Add Polygons
 ~~~~~~~~~~~~
 
-You can also add Polygons, which represents an area enclosed by a series of ``Point`` instances:
+You can also add Polygons, which represents an area enclosed by a series of ``Point`` instances::
 
     $myMap->addPolygon(new Polygon(
         points: [