"THIS DOCUMENT DOES NOT CREATE AN EMPLOYMENT CONTRACT BETWEEN THE EMPLOYEE AND THE COMPANY."

The langauge you're referring to in the document is fairly common in documents issued from employers to employees.  In Pennsylvania, employees generally have "at will" status; meaning that the employer can terminate their employment for any reason (or no reason).  There are some exceptions to this.  Employers cannot unlawfully discriminate based upon gender, race and the like.  Another exception is if the employer and employee enter into a contract that takes the employee out of "at will" status.  Such agreements might detail the circumstances under which an employer can terminate the employee.  This type of language, when used by employers, is intended to avoid having the document on which it appears, be construed by the employee or the courts as an agreement to change the employee's status from something other than "at-will".  It generally has no bearing on the enforceability of the document for other purposes.