[Configuration Guide] alias attribute description should specify separator

Book: Configuration Guide
Section: Appendix A. Reference Material
Version: n_2306821_configuration-guide_version_7.0_edition_1.0_release_0-revision_8851881

Issue description:
There is insufficient description of alias attribute in table Table A.58. host Attributes. There is missing how to set multiple aliases (separator).

Suggestions for improvement:
Specify separator that can be used to set multiple aliases.