Gen-ART 25

From: Mary Barnes

Description: -Section 5.3.2.2 [6.3.2.2]:
--Paragraph after second structure, suggest the following changes:
---"the generation counters should" ->  "the generation counters SHOULD"
---"An implementation could use.." -> "An implementation MAY use…"
---"the node confirms that the generation counter matches" -> "the node MUST confirm that the generation counter matches"
---"If it does not match, it is silently dropped." -> "If it does not match, it MUST be silently dropped."

Notes: Will fix text as suggested.