Document intention of toString() in HandlerMethod

Document that HandlerMethod.toString() is used in log and error messages,
and that the returned description should typically include the method
signature of the underlying handler method for clarity and debugging.

Closes gh-35055

Signed-off-by: WonYong Hwang <[email protected]>
Co-authored-by: Sam Brannen <[email protected]>

Author: wonyongg

spring-web/src/main/java/org/springframework/web/method/HandlerMethod.java

@@ -352,6 +352,12 @@ public int hashCode() {
 		return (this.bean.hashCode() * 31 + super.hashCode());
 	}
 
+	/**
+	 * Returns a concise description of this {@code HandlerMethod}, which is used
+	 * in log and error messages.
+	 * <p>The description should typically include the method signature of the
+	 * underlying handler method for clarity and debugging purposes.
+	 */
 	@Override
 	public String toString() {
 		return this.description;