Here you can edit general properties of the currently edited permission. These are:
•Permission display name - name of the permission displayed in Kentico CMS UI.
•Permission code name - name of the permission used in website code.
•Permission description - text providing more details about the permission (typically where and when it is checked).
•Display in matrix - indicates if the permission should be displayed in the module's permissions matrix.
•Editable only by global admin - if enabled, the permission can only be granted to users or roles by the global administrator.
More resources on Permissions can be found in Developer's Guide -> Development -> Membership, permissions and security -> Permissions -> Permissions overview.