Fix typo in event grouping documentation (#14825)

## DESCRIBE YOUR PR
Fixed a typo. 

## IS YOUR CHANGE URGENT?  

Help us prioritize incoming PRs by letting us know when the change needs
to go live.
- [ ] Urgent deadline (GA date, etc.): <!-- ENTER DATE HERE -->
- [ ] Other deadline: <!-- ENTER DATE HERE -->
- [x] None: Not urgent, can wait up to 1 week+

Author: jerryzhou196

docs/concepts/data-management/event-grouping/index.mdx

@@ -16,7 +16,7 @@ When you create a Sentry project, the most recent version of the error grouping
 
 All versions consider the `fingerprint` first, the `stack trace` next, then the `exception`, and then finally the `message`.
 
-To see how an isssue was grouped, go to its **Issue Details** page and scroll down to "Event Grouping Information". There, you'll see if it was grouped by a fingerprint, stack trace, exception, or message.
+To see how an issue was grouped, go to its **Issue Details** page and scroll down to "Event Grouping Information". There, you'll see if it was grouped by a fingerprint, stack trace, exception, or message.
 
 ### Grouping by Built-In Fingerprinting Rules