Add guidance: avoid hyphenating with "ly" suffix

[julian-cable]

Guidance to add:
Do not hyphenate an adverb that ends with an “ly” suffix.

Original example:
"Red{nbsp}Hat Enterprise Linux is a production-ready, commercially-supported Linux distribution."

Improvement example:
"Red{nbsp}Hat Enterprise Linux is a production-ready, commercially supported Linux distribution."

[julian-cable]

Guidance already in style guide; added an example.