chore(docs): Fix link in release notes (#20454)

      * chore(docs): Fix link in release notes

* Update website/content/en/highlights/2024-05-07-0-38-0-upgrade-guide.md

Co-authored-by: May Lee <mayl@alumni.cmu.edu>

---------

Co-authored-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>
Co-authored-by: May Lee <mayl@alumni.cmu.edu>

website/content/en/highlights/2024-05-07-0-38-0-upgrade-guide.md

@@ -15,7 +15,7 @@ Vector's 0.38.0 release includes a **breaking change**:
 
 and **deprecations**:
 
-1. [Deprecation of undefined environment variable warnings](#strict-env-vars)
+1. [Deprecation of the path coalescing operator](#path-coalescing)
 1. [Deprecation of `enterprise` configuration](#enterprise-configuration)
 
 We cover them below to help you upgrade quickly:
@@ -44,10 +44,10 @@ groups to avoid interpolation. For example, instead of using `$1`, you need to a
 #### Path coalescing is deprecated {#path-coalescing}
 
 Coalescing of field lookup paths (e.g. `.(field1|field2)`) are deprecated and will be removed in
-a future version. This feature did not seem to be used much and significantly complicates the parts
+a future version. This feature did not seem to be used much and significantly complicates parts
 of the codebase.
 
-If you were using this feature, you can accomplish the same through conditionals like:
+If you were using this feature, you can accomplish the same through conditionals in VRL like:
 
 ```vrl
 field = if exists(.field1) {