minor change to section_glance-property-protection

added a . after images and created new sentence
capitalized Typically for new sentence

Change-Id: I965a001424a01332e9c16ec0cbccb9b4ba6c7dd6
O'Reilly Edits for the glossary

Edits done for the Operations Guide, will be copied over after
review.
This uses now "back-end" as adjective and "back end" as noun.

Change-Id: I2b8384a80fdd17e88f214bdf0ac47d42264bf19f
It's software-defined networking

Follow the rest of the manuals for this spelling.

Change-Id: Ibaaec68ce301f4851f5f2a979b2234112f99b7cc
Merge "minor change to section_glance-property-protection"
Merge "It's software-defined networking"
Merge "O'Reilly Edits for the glossary"