docs(example): update README.md (#373)

Because

- the documentation adopts the US spelling

This commit

- review the UK spelling to the US one, i.e., `visualisation` ->
`visualization`

examples/README.md

@@ -19,7 +19,7 @@ To better represent what is in each example folder, we follow a strict naming ru
 Example:
 `metabase-cv-object-deteciton-async-http-postgres`
 
-- `{app}(optional)` indicates the app used in this example. For instance, `metabase` is an online interactive front-end that provides real-time data extraction from databases and visualisation.
+- `{app}(optional)` indicates the app used in this example. For instance, `metabase` is an online interactive front-end that provides real-time data extraction from databases and visualization.
 - `{AI task}` indicates the AI task demonstrated in the example. `cv-object-deteciton` means the AI task is an object detection in computer vision (CV).  
 - `{pipeline_mode}` indicates the pipeline modes, including `SYNC`, `ASYNC`, and `PULL`.
 - `{source}` denotes the source connector of the pipeline. At the moment, VDP supports HTTP and gRPC.
@@ -28,4 +28,4 @@ Example:
 
 ## Example for Tutorials
 - `instill` consists of examples where ML models are trained by Instill AI.
-- `vdp-101` consists of examples used in the VDP-101 series. You can find basic but versatile examples to start building your pipelines.
+- `vdp-101` consists of examples used in the VDP-101 series. You can find basic but versatile examples to start building your pipelines.