docs: Fix CompareFlags documentation (facebookincubator#15706)

Summary:
Fixes typo in CompareFlags documentation. Enables accurate Copilot code reviews.

Pull Request resolved: facebookincubator#15706

Reviewed By: kagamiori

Differential Revision: D89483371

Pulled By: kKPulla

fbshipit-source-id: 1fc6b0793933f46d0b404bd6952520c62304f070

Author: pramodsatya

velox/common/base/CompareFlags.h

@@ -84,7 +84,7 @@ struct CompareFlags {
     ///       ex: (null, 1) = (null, 1) is indeterminate.
     ///
     ///       - If all fields compare results are true, then result is true.
-    ///       ex: (1, 1) = (1, 1) is indeterminate.
+    ///       ex: (1, 1) = (1, 1) is true.
     ///
     ///   4. Maps:
     ///     - Keys are compared first, if keys are not equal values are not