improve: doc fixes for micrometer metrics (#3222)

Signed-off-by: Attila Mészáros <a_meszaros@apple.com>

Author: csviri

docs/content/en/docs/documentation/observability.md

@@ -88,22 +88,22 @@ The simplest way to create an instance:
 
 ```java
 MeterRegistry registry; // initialize your registry implementation
-Metrics metrics = MicrometerMetricsV2.newMicrometerMetricsV2Builder(registry).build();
+Metrics metrics = MicrometerMetricsV2.newBuilder(registry).build();
 ```
 
 Optionally, include a `namespace` tag on per-reconciliation counters (disabled by default to avoid unexpected
 cardinality increases in existing deployments):
 
 ```java
-Metrics metrics = MicrometerMetricsV2.newMicrometerMetricsV2Builder(registry)
+Metrics metrics = MicrometerMetricsV2.newBuilder(registry)
         .withNamespaceAsTag()
         .build();
 ```
 
 You can also supply a custom timer configuration for `reconciliations.execution.duration`:
 
 ```java
-Metrics metrics = MicrometerMetricsV2.newMicrometerMetricsV2Builder(registry)
+Metrics metrics = MicrometerMetricsV2.newBuilder(registry)
         .withExecutionTimerConfig(builder -> builder.publishPercentiles(0.5, 0.95, 0.99))
         .build();
 ```