minor #2229 Update index.rst (ebedy)

This PR was merged into the 2.x branch.

Discussion
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Update index.rst

Correction du nom de la variable $map -> $myMap

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

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Commits
-------

e7ddc1d Update index.rst

Author: javiereguiluz

src/Map/doc/index.rst

@@ -120,7 +120,7 @@ A map is created by calling ``new Map()``. You can configure the center, zoom, a
             ;
 
             // 3. You can also add Polygons, which represents an area enclosed by a series of `Point` instances
-            $map->addPolygon(new Polygon(
+            $myMap->addPolygon(new Polygon(
                 points: [
                     new Point(48.8566, 2.3522),
                     new Point(45.7640, 4.8357),