function info( alias ) {
	if ( !isString( alias ) ) {
		throw new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', alias ) );
	}
	if ( hasOwnProp( ALIAS_TO_INFO, alias ) ) {
		return ALIAS_TO_INFO[ alias ];
	}
	return null;
}
Returns an abbreviated help text associated with a specified alias.

@param {string} alias - alias
@throws {TypeError} must provide a string
@returns {(string|null)} help text

@example
var out = info( 'base.sin' );
// returns <string>