Consolidate similar parts of REC revision

Revising a REC is a fairly complicated piece of the Process. The 4
subsections that deal with making revisions for class 1 through 4 are
comparatively simple, but they had very strong similarities between
class 1 and 2, and class 3 and 4. Consolidating the text not only makes
the whole thing shorter, it also eliminates subtle differences of
language that could leave people wondering about potential differences
where none were intended or useful.

This is a small part in addressing w3c#700

index.bs

@@ -3956,7 +3956,7 @@ Transitioning to Proposed Recommendation</h4>
 	as intending to <dfn>allow new features</dfn>
 	(<a href="#correction-classes">class 4 changes</a>)
 	after its initial publication as a [=Recommendation=],
-	as described in [[#revised-rec-features]].
+	as described in [[#revised-rec-substantive]].
 	Such an allowance cannot be added
 	to a [=technical report=] previously published as a [=Recommendation=]
 	that did not allow such changes.
@@ -4039,38 +4039,43 @@ Transitioning to W3C Recommendation</h4>
 <h4 id=revising-rec oldids="rec-modify, revised-rec">
 Revising a W3C Recommendation</h4>
 
-	This section details the process for making changes to a [=Recommendation=].
-
-<h5 id="revised-rec-markup">
-Revising a Recommendation: Markup Changes</h5>
-
-	A [=Working group=] <em class="rfc2119">may</em> request republication of a [=Recommendation=]
-	to make corrections that do not result
-	in any changes to the text of the specification.
-	(See <a href="#correction-classes">class 1 changes</a>.)
-
-<h5 id="revised-rec-editorial">
+<h5 id="revised-rec-editorial" oldids="revised-rec-markup">
 Revising a Recommendation: Editorial Changes</h5>
 
 	[=Editorial changes=] to a [=Recommendation=] require no technical review of the intended changes.
 	A [=Working Group=],
 	provided there are no votes against the [=group decision|decision=] to publish,
 	<em class="rfc2119">may</em> request publication of a [=Recommendation=]
 	to make this class of change without passing through earlier maturity stages.
-	(See <a href="#correction-classes">class 2 changes</a>.)
+	(See <a href="#class-1">class 1</a> and <a href="#class-2">class 2 changes</a>.)
 
-<h5 id="revised-rec-substantive">
+<h5 id="revised-rec-substantive" oldids="revised-rec-features">
 Revising a Recommendation: Substantive Changes</h5>
 
 	Tentative corrections (see <a href="#class-3">class 3 changes</a>)
 	<em class=rfc2119>may</em> be annotated into a [=Recommendation=]
 	using [=candidate corrections=].
 
-	Note: [=Candidate corrections=] do not normatively modify the document;
+	Tentative new features (see <a href="#correction-classes">class 4 changes</a>)
+	<em class=rfc2119>may</em> only be annotated into a [=Recommendation=]
+	explicitly identified as [=allow new features|allowing new features=]
+	using [=candidate additions=].
+
+	Note: [=Candidate amendments=] ([=candidate correction|corrections=] and [=candidate addition|additions=]) do not normatively modify the document;
 	they editorially indicate how one might do so.
 	They are therefore published following the provisions of [[#revised-rec-editorial]].
 
-	A [=candidate correction=] can be made normative
+	To make changes which introduce a new feature
+	to a [=Recommendation=] that does not [=allow new features=],
+	W3C <em class="rfc2119">must</em> create a new [=technical report=],
+	following the full process of <a href="#rec-advance">advancing a technical report to Recommendation</a>
+	beginning with a new [=First Public Working Draft=].
+
+	Note: This prohibition against new features unless explicitly allowed
+	enables third parties to depend on Recommendations having a stable feature-set,
+	as they have prior to the 2020 revision of this Process.
+
+	A [=candidate amendment=] can be made normative
 	and be folded into the main text of the [=Recommendation=],
 	once it has satisfied all the same criteria
 	as the rest of the [=Recommendation=],
@@ -4089,33 +4094,6 @@ Revising a Recommendation: Substantive Changes</h5>
 	and advance the specification from that state.
 	(See <a href="#correction-classes">class 3 changes</a>.)
 
-<h5 id="revised-rec-features">
-Revising a Recommendation: New Features</h5>
-
-	Tentative new features (see <a href="#correction-classes">class 4 changes</a>)
-	<em class=rfc2119>may</em> be annotated into a [=Recommendation=]
-	explicitly identified as [=allow new features|allowing new features=]
-	using [=candidate additions=].
-
-	Note: [=Candidate additions=] do not normatively modify the document;
-	they editorially indicate how one might do so.
-	They are therefore published following the provisions of [[#revised-rec-editorial]].
-
-	A [=candidate addition=] can be made normative
-	and be folded into the main text of the [=Recommendation=]
-	using the same process as for [=candidate corrections=],
-	as detailed in [[#revised-rec-substantive]].
-
-	Note: This prohibition against new features unless explicitly allowed
-	enables third parties to depend on Recommendations having a stable feature-set,
-	as they have prior to the 2020 revision of this Process.
-
-	To make changes which introduce a new feature
-	to a [=Recommendation=] that does not [=allow new features=],
-	W3C <em class="rfc2119">must</em> create a new [=technical report=],
-	following the full process of <a href="#rec-advance">advancing a technical report to Recommendation</a>
-	beginning with a new [=First Public Working Draft=].
-
 <h5 id=change-review>
 Incorporating Candidate Amendments</h5>