chore(rel): fix formatting for changelog (#1059)

Fix formatting for code block in changelog

## Pull Request approval

You will need to get your PR approved by at least one member of the
Sourcegraph team. For reviews of docs formatting, styles, and component
usage, please tag the docs team via the #docs Slack channel.

Author: jdpleiness

docs/technical-changelog.mdx

@@ -174,13 +174,15 @@ This page documents all notable changes to Sourcegraph. For more detailed change
 - Rename scope refinement options for (hopefull) better clarity `(PR #4341)`
 - enable personalized ranking by default `(PR #4148)`
   - We've enabled personalized ranking for search results in the new web app—marking the first step in integrating user-specific ranking signals into our search pipeline. As a result, queries spanning multiple repositories will prioritize results from repositories the user has frequently contributed to.User can disable the feature by setting `boostRelevantRepositories` to false in the settings
-  ```
-\{
-  "experimentalFeatures": \{
+
+```json
+{
+  "experimentalFeatures": {
     "boostRelevantRepositories": false,
-  \},
-\}
+  },
+}
 ```
+
 - (new web ui) Add support for capture group aggregation `(PR #4122)`
 - Add repo metadata editing `(PR #4086)`
 - Add simple form validation/handling library `(PR #4084)`
@@ -8877,3 +8879,4 @@ The following PRs were merged onto the previous release branch but could not be
 ## Older versions
 
 For older versions of Sourcegraph, see the [CHANGELOG](https://github.com/sourcegraph/sourcegraph-public-snapshot/blob/main/CHANGELOG.md) on GitHub.
+```