wdisp/max_servers is a SAP Parameter attribute which is used to control Maximum number of entries of server info table information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter determines the maximum number of entries in the SAP Web
Dispatcher�s server table.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.