update wording to reflect UI

src/docs/product/issues/issue-details/index.mdx

@@ -8,7 +8,7 @@ The **Issue Details** page helps you to gain further insight into the source of
 
 ![Issue details](issue_details_page.png)
 
-While the <SandboxLink scenario="oneIssue" projectSlug="react">Issue Details</SandboxLink> page displays information about a specific event that's part of an issue, you can navigate between the events of an issue using the "Older" and "Newer" buttons.
+While the <SandboxLink scenario="oneIssue" projectSlug="react">Issue Details</SandboxLink> page displays information about a specific event that's part of an issue. You can navigate between the events of an issue using the event dropdown.
 
 In the right hand sidebar, [sentry.io](https://sentry.io) reflects a summary that includes information such as how often the <SandboxLink scenario="oneIssue" projectSlug="react">issue</SandboxLink> has occurred in the last 24 hours and the last 30 days, as well as the last time and the first time the issue was seen. If the issue is linked to any GitHub or Jira issues, that's displayed here as well. Lastly, there is a facet map, which shows the distribution of values for the tags for all events included in the issue. All of these values are based on the environment that you've selected in the environment dropdown.