fix: correct async/sync provider log messages in McpPredicates (#89)

- Fix ASYNC provider warning (was mislabeled as Sync with wrong return type description)
- Fix SYNC provider warning capitalization and grammar

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

Author: tzolov

mcp-annotations/src/main/java/org/springaicommunity/mcp/McpPredicates.java

@@ -54,7 +54,7 @@ public static Predicate<Method> filterNonReactiveReturnTypeMethod() {
 				return true;
 			}
 			logger.warn(
-					"Sync providers doesn't support reactive return types. Skipping method {} with reactive return type {}",
+					"ASYNC Providers don't support imperative (non-reactive) return types. Skipping method {} with non-reactive return type {}",
 					method, method.getReturnType());
 			return false;
 		};
@@ -66,7 +66,7 @@ public static Predicate<Method> filterReactiveReturnTypeMethod() {
 				return true;
 			}
 			logger.warn(
-					"Sync providers doesn't support reactive return types. Skipping method {} with reactive return type {}",
+					"SYNC Providers don't support reactive return types. Skipping method {} with reactive return type {}",
 					method, method.getReturnType());
 			return false;
 		};