Describe the bug

Incorrect instructions in the docs.

To Reproduce

Steps to reproduce the behavior:

1. Go to Installation Script Experimental.
2. Run the wget command (works fine) to download install-decidim.sh.
3. The second command does not work, chmod +x decidim-install.sh. File name doesn't exist because that's not the name of the downloaded file.

Expected behavior

chmod +x install-decidim.sh

Offending file

decidim/docs/modules/install/pages/index.adoc