[7.1] Migration Guide 7.1: Having Alpha in EAP version breaks some examples

Some topics in migration guide are broken due to recent change in Version variable. Maybe we should remove the word Alpha from the book at all.

Some examples:
"If you installed JBoss EAP using the ZIP install method, the install directory is the jboss-eap-7.1.Alpha directory where you extracted the ZIP archive."
The name of the directory will be jboss-eap-7.1

"Cumulative patches increment the release by the last digit, for example from 7.1.Alpha.0 to 7.1.Alpha.1."
There is no Alpha.0 and Alpha.1 version