Regenerate observability doc partials for renamed metric

Regenerated by micrometer-docs-generator after the gateway client
observation metric rename in the previous commits. No hand edits.

See gh-3153

Signed-off-by: JOOYOUNG JUNG <143606756+LivingLikeKrillin@users.noreply.github.com>

Author: LivingLikeKrillin

docs/modules/ROOT/partials/_metrics.adoc

@@ -11,9 +11,9 @@ Observation created when sending a request through the gateway.
 ____
 
 
-**Metric name** `http.client.requests` (defined by convention class `org.springframework.cloud.gateway.filter.headers.observation.DefaultGatewayObservationConvention`). **Type** `timer`.
+**Metric name** `spring.cloud.gateway.http.client.requests` (defined by convention class `org.springframework.cloud.gateway.filter.headers.observation.DefaultGatewayObservationConvention`). **Type** `timer`.
 
-**Metric name** `http.client.requests.active` (defined by convention class `org.springframework.cloud.gateway.filter.headers.observation.DefaultGatewayObservationConvention`). **Type** `long task timer`.
+**Metric name** `spring.cloud.gateway.http.client.requests.active` (defined by convention class `org.springframework.cloud.gateway.filter.headers.observation.DefaultGatewayObservationConvention`). **Type** `long task timer`.
 
 
 IMPORTANT: KeyValues that are added after starting the Observation might be missing from the *.active metrics.

docs/modules/ROOT/partials/_spans.adoc

@@ -8,7 +8,7 @@ Below you can find a list of all spans declared by this project.
 
 > Observation created when sending a request through the gateway.
 
-**Span name** `http.client.requests` (defined by convention class `org.springframework.cloud.gateway.filter.headers.observation.DefaultGatewayObservationConvention`).
+**Span name** `spring.cloud.gateway.http.client.requests` (defined by convention class `org.springframework.cloud.gateway.filter.headers.observation.DefaultGatewayObservationConvention`).
 
 Fully qualified name of the enclosing class `org.springframework.cloud.gateway.filter.headers.observation.GatewayDocumentedObservation`.