move some RFC links to :cite

obsolete rfc updates:
 - rfc7232 --> rfc9110
 - rfc5987 --> rfc8187

Author: hacdias

mature/http-gateways/path-gateway.md

@@ -266,8 +266,7 @@ making a new request.
 
 Error to indicate that request was formally correct, but this specific Gateway
 is unable to return requested data due to legal reasons. Response SHOULD
-include an explanation, as noted in
-[RFC7725.html#n-451-unavailable-for-legal-reasons](https://httpwg.org/specs/rfc7725.html#n-451-unavailable-for-legal-reasons).
+include an explanation, as noted in Section 3 of :cite[rfc7725].
 
 See: [Denylists](#denylists)
 
@@ -286,7 +285,7 @@ Returned when Gateway was not able to produce response under set limits.
 Used for HTTP caching.
 
 An opaque identifier for a specific version of the returned payload. The unique
-value must be wrapped by double quotes as noted in [RFC7232#Etag](https://httpwg.org/specs/rfc7232.html#header.etag).
+value must be wrapped by double quotes as noted in Section 8.8.3 of :cite[rfc9110].
 
 In many cases it is not enough to base `Etag` value on requested CID.
 
@@ -334,7 +333,7 @@ Returned directive depends on requested content path and format:
   indicate remaining TTL of the mutable pointer such as IPNS record or DNSLink
   TXT record.
   - Implementations are free to place an upper bound on any TTL received, as
-    noted in [RFC 2131 Section 8](https://datatracker.ietf.org/doc/html/rfc2181#section-8).
+    noted in Section 8 of :cite[rfc2131].
   - If TTL value is unknown, implementations are free to set it to a static
     value, but it should not be lower than 60 seconds.
 
@@ -354,7 +353,7 @@ Returning this header depends on the information available:
 - Legacy implementations set this header to the current timestamp when reading
   TTL on  `/ipns/` content paths was not available. This hint was used by web
   browsers in a process called  "Calculating Heuristic Freshness"
-  ([RFC7234](https://tools.ietf.org/html/rfc7234#section-4.2.2)). Each browser
+  (Section 4.2.2 of :cite[rfc9111]). Each browser
   uses different heuristic, making this an inferior, non-deterministic caching
   strategy.
 
@@ -408,8 +407,8 @@ To illustrate, `?filename=testтест.pdf` should produce:
 `Content-Disposition inline; filename="test____.jpg"; filename*=UTF-8''test%D1%82%D0%B5%D1%81%D1%82.jpg`
 
 - ASCII representation must have non-ASCII characters replaced with `_`
-- UTF-8 representation must be wrapped in Percent Encoding ([RFC 3986, Section 2.1](https://www.rfc-editor.org/rfc/rfc3986.html#section-2.1)).
-  - NOTE: `UTF-8''` is not a typo – see [Examples in RFC5987](https://datatracker.ietf.org/doc/html/rfc5987#section-3.2.2)
+- UTF-8 representation must be wrapped in Percent Encoding (Section 2.1 of :cite[rfc3986]).
+  - NOTE: `UTF-8''` is not a typo – see Section 3.2.3 of :cite[rfc8187].
 
 `Content-Disposition` must be also set when a binary response format was requested:
 
@@ -434,7 +433,7 @@ NOTE: the value may differ from the real size of requested data if compression o
 
 Returned only when request was a [`Range`](#range-request-header) request.
 
-See [RFC7233#header.content-range](https://httpwg.org/specs/rfc7233.html#header.content-range).
+See Section 14.4 of :cite[rfc9110].
 
 ### `Accept-Ranges` (response header)