add docs for 'core multisite-install'

diff --git a/man-src/core-multisite-install.txt b/man-src/core-multisite-install.txt
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+## OPTIONS
+
+* `--url`=<url>:
+
+       The address of the new site.
+
+* `--base`=<url-path>:
+
+       Base path after the domain name that each site url in the network will start with.
+Default: '/'
+
+* `--subdomains`:
+
+       If passed, the network will use subdomains, instead of subdirectories.
+
+* `--title`=<site-title>:
+
+       The title of the new site.
+
+* `--admin_name`=<username>:
+
+       The name of the admin user. Default: 'admin'
+
+* `--admin_password`=<password>:
+
+       The password for the admin user.
+
+* `--admin_email`=<email>:
+
+       The email address for the admin user.