fix: correcting a mislabeled CHANGELOG.md entry (#5614)

Author: kpsroka

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ### Fixes
 
-* `[enzyme]` Allow matching of Errors against plain objects
+* `[expect]` Allow matching of Errors against plain objects
   ([#5611](https://github.com/facebook/jest/pull/5611))
 * `[jest-cli]` Don't skip matchers for exact files
   ([#5582](https://github.com/facebook/jest/pull/5582))