[MINOR][DOCS] Fix a typo in core-migration-guide.md

### What changes were proposed in this pull request?

 Fix a typo in core-migration-guide.md:

- agressively -> aggressively

### Why are the changes needed?

Fix mistakes.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Passed GA.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes apache#46864 from wayneguow/typo.

Authored-by: Wei Guo <guow93@gmail.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

docs/core-migration-guide.md

@@ -48,7 +48,7 @@ license: |
 
 - Since Spark 4.0, the MDC (Mapped Diagnostic Context) key for Spark task names in Spark logs has been changed from `mdc.taskName` to `task_name`. To use the key `mdc.taskName`, you can set `spark.log.legacyTaskNameMdc.enabled` to `true`.
 
-- Since Spark 4.0, Spark performs speculative executions less agressively with `spark.speculation.multiplier=3` and `spark.speculation.quantile=0.9`. To restore the legacy behavior, you can set `spark.speculation.multiplier=1.5` and `spark.speculation.quantile=0.75`.
+- Since Spark 4.0, Spark performs speculative executions less aggressively with `spark.speculation.multiplier=3` and `spark.speculation.quantile=0.9`. To restore the legacy behavior, you can set `spark.speculation.multiplier=1.5` and `spark.speculation.quantile=0.75`.
 
 ## Upgrading from Core 3.4 to 3.5