Fix spec-build errors (editorial) (#1461)

* Fix spec-build errors (editorial)

we have a few loose-end editorial link-errors and unreferenced dfns, this addresses almost all of those. there's one link-error remaining, am not sure yet how to deal with it.

* yank {{evalByCredential}} experiment

* number steps such that gen'd html is correct

index.bs

@@ -5782,7 +5782,7 @@ Note: If PRF results are obtained during [=registration=] then the [=[RP]=] MUST
           1. Decrypt the extension result and set {{AuthenticationExtensionsPRFOutputs/results}} to the PRF result(s), if any.
 
 : Authenticator extension input / processing / output
-:: This extension uses the [[FIDO-CTAP]] `hmac-secret` extension when communicating with the authenticator. It thus does not specify any direct authenticator interaction for [=[RPS]=].
+:: [=prf|This extension=] uses the [[FIDO-CTAP]] `hmac-secret` extension when communicating with the authenticator. It thus does not specify any direct authenticator interaction for [=[RPS]=].
 
 : Client extension output
 :: <xmp class="idl">
@@ -5873,7 +5873,7 @@ Note: In order to interoperate, user agents storing large blobs on authenticator
 
 
 : Authenticator extension processing
-:: This extension directs the user-agent to cause the large blob to be stored on, or retrieved from, the authenticator. It thus does not specify any direct authenticator interaction for [=[RPS]=].
+:: [=largeblob|This extension=] directs the user-agent to cause the large blob to be stored on, or retrieved from, the authenticator. It thus does not specify any direct authenticator interaction for [=[RPS]=].
 
 
 # User Agent Automation # {#sctn-automation}
@@ -5907,13 +5907,14 @@ In order to advertise the availability of the [=extension commands=] defined bel
 
 When [=validating capabilities=], the extension-specific substeps to validate `"webauthn:virtualAuthenticators"` with `value` are the following:
 
-    ::  If `value` is not a [=boolean=] return a [=WebDriver Error=] with [=WebDriver error code=] [=invalid argument=].
-        Otherwise, let `deserialized` be set to `value`.
+    1. If `value` is not a [=boolean=] return a [=WebDriver Error=] with [=WebDriver error code=] [=invalid argument=].
+    2. Otherwise, let `deserialized` be set to `value`.
 
 When [=matching capabilities=], the extension-specific steps to match `"webauthn:virtualAuthenticators"` with `value` are the following:
 
-    ::  If `value` is [TRUE] and the [=endpoint node=] does not support any of the [=Virtual Authenticators=] commands,
-        the match is unsuccessful. Otherwise, the match is successful.
+    1. If `value` is [TRUE] and the [=endpoint node=] does not support any of the [=Virtual Authenticators=] commands,
+        the match is unsuccessful.
+    2. Otherwise, the match is successful.
 
 ## <dfn>Virtual Authenticators</dfn> ## {#sctn-automation-virtual-authenticators}