[Docs] fix typo in TSVB README (opensearch-project#3518)

Fixes a small typo in TSVB README.md file.

Issue:
n/a

Signed-off-by: Kawika Avilla <kavilla414@gmail.com>
Signed-off-by: David Sinclair <david@sinclair.tech>

CHANGELOG.md

@@ -211,6 +211,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Add sample config for multi data source feature in yml template. ([#2428](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2428))
 - README.md for dataSource and dataSourceManagement Plugin ([#2448](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2448))
 - Updates functionl testing information in Testing.md ([#2492](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2492))
+- Fixes typo in TSVB README ([#3518](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3518))
 
 ### 🛠 Maintenance
 

src/plugins/vis_type_timeseries/README.md

@@ -1 +1 @@
-Contains everything around TSVB (the editor, visualizatin implementations and backends).
+Contains everything around TSVB (the editor, visualization implementations and backends).