Update enable-sse-c.mdx (scaleway#3986)

Fix the command

Author: CesarRoaldes

storage/object/api-cli/enable-sse-c.mdx

@@ -88,8 +88,7 @@ If you lose the encryption key, you also lose the data encrypted with it, as you
     ```sh
     aws s3api head-object \
     --bucket <your-bucket-name> \
-    --key <your-object-key> \
-    <path/to/your/file> \
+    --key <your-object-key>
     ```
     An error message similar to the following should display:
     ```