Polish HttpStatus 103 EARLY_HINTS javadocs (#29841)

This commit polishes the EARLY_HINTS javadocs a bit:
 - fix a typo
 - fix `since` tags to include the patch version

See gh-29816

spring-test/src/main/java/org/springframework/test/web/servlet/result/StatusResultMatchers.java

@@ -148,13 +148,14 @@ public class StatusResultMatchers {
 	 * @see #isEarlyHints()
 	 * @deprecated in favor of {@link #isEarlyHints()}
 	 */
-	@Deprecated(since = "6.0")
+	@Deprecated(since = "6.0.5")
 	public ResultMatcher isCheckpoint() {
 		return isEarlyHints();
 	}
 
 	/**
 	 * Assert the response status code is {@code HttpStatus.EARLY_HINTS} (103).
+	 * @since 6.0.5
 	 */
 	public ResultMatcher isEarlyHints() {
 		return matcher(HttpStatus.valueOf(103));