Update windows.mdx for french translation

French translation of windows.mdx, never used git before, hope i made the pull request 

Signed-off-by: Amaury <[email protected]>

Author: amauryrob

i18n/fr/docusaurus-plugin-content-docs/current/installation/windows.mdx

@@ -1,6 +1,6 @@
 ---
 title: Installation sur Windows
-description: Instructions pour installer SideStore en utilisant Windows
+description: Instructions pour installer SideStore en utilisant Windows.
 sidebar_position: 3
 ---