docs: minor comment on impl (#2355)

Signed-off-by: Attila Mészáros <[email protected]>

Author: csviri

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/dependent/kubernetes/updatermatcher/GenericResourceUpdaterMatcher.java

@@ -30,6 +30,8 @@ public R updateResource(R actual, R desired, Context<?> context) {
     Map<String, Object> actualMap = kubernetesSerialization.convertValue(actual, Map.class);
     Map<String, Object> desiredMap = kubernetesSerialization.convertValue(desired, Map.class);
     // replace all top level fields from actual with desired, but merge metadata separately
+    // note that this ensures that `resourceVersion` is present, therefore optimistic
+    // locking will happen on server side
     var metadata = actualMap.remove(METADATA);
     actualMap.replaceAll((k, v) -> desiredMap.get(k));
     actualMap.putAll(desiredMap);