ARROW-13524: [C++] Fix description for ApplicationVersion::VersionEq

fix the comment about metadata

Closes #10850 from darionyaphet/fix-meta

Authored-by: darion.yaphet <darion.yaphet@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>
diff --git a/cpp/src/parquet/metadata.h b/cpp/src/parquet/metadata.h
index 1865115..e8d20bc 100644
--- a/cpp/src/parquet/metadata.h
+++ b/cpp/src/parquet/metadata.h
@@ -84,7 +84,7 @@
   // Returns true if version is strictly less than other_version
   bool VersionLt(const ApplicationVersion& other_version) const;
 
-  // Returns true if version is strictly less than other_version
+  // Returns true if version is strictly equal with other_version
   bool VersionEq(const ApplicationVersion& other_version) const;
 
   // Checks if the Version has the correct statistics for a given column