Docs: Fix typo and clarify need for query editor (#27796)

* Fix typo and clarify need for query editor

* Update docs/sources/developers/plugins/add-support-for-annotations.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

docs/sources/developers/plugins/add-support-for-annotations.md

@@ -15,7 +15,7 @@ Handling annotation queries is similar to how you'd handle a metrics query. The
 
 ## Add annotations support to your data source
 
-To add logs support to an existing data source, you need to:
+To add support for annotations to an existing data source, you need to:
 
 - Enable annotations support
 - Override the `annotationQuery` method
@@ -81,9 +81,9 @@ const regionEvent: AnnotationEvent = {
 
 ## Build a annotation query editor
 
-Let users write custom annotation queries to only display the annotation events they care about, by adding a _query editor_.
+Let users write custom annotation queries to only display the annotation events they care about, by adding a _query editor_. You only need to build a query editor if you want to let users query or filter annotations.
 
-> **Note**: Annotation query editors have yet to receive support for React. The instructions here are given for Angular. Fortunately, you can run Angular even in a plugin otherwise written using React. This section will be updated once React support for annotation queries editors is available.
+> **Note:** Annotation query editors have yet to receive support for React. The instructions here are given for Angular. Fortunately, you can run Angular even in a plugin otherwise written using React. This section will be updated once React support for annotation queries editors is available.
 
 1. Create a file called `AnnotationQueryEditor.ts` in the `src` directory, with the following content.