Update docker.md (#2578)

Corrected strapi network mismatch issues. In docker compose everywhere "strapi" as network has been used but in the last segment where network is explicitly is defined it is written "Strapi" due to which while running docker compose up -d it terminates old container and restricts new container due to network mismatch and then i had to manually delete old container and run new container with new network name.

Author: Tasleem222

docusaurus/docs/cms/installation/docker.md

@@ -187,7 +187,7 @@ volumes:
 
 networks:
   strapi:
-    name: Strapi
+    name: strapi
     driver: bridge
 ```
 
@@ -253,7 +253,7 @@ volumes:
 
 networks:
   strapi:
-    name: Strapi
+    name: strapi
     driver: bridge
 ```
 
@@ -319,7 +319,7 @@ volumes:
 
 networks:
   strapi:
-    name: Strapi
+    name: strapi
     driver: bridge
 ```