Shortcode names cannot begin with a number

[Jessica Stokes]

Documentation issue

Summary

Shortcode names are described in the documentation as accepting any alphanumeric characters, but this isn't quite true. In fact, according to the syntax definition file, the first character must be alphabetical or an underscore. This is also true of keyword arguments to shortcakes.

Proposed solution

Update the documentation to specify that shortcakes and keyword arguments must start with an alphabetical character or underscore.