improve formatting

Author: vpchung

README.md

@@ -109,10 +109,14 @@ Python are provided.
 >
 > ```
 > # Single-platform build
-> docker build --platform linux/amd64 -t docker.synapse.org/PROJECT_ID/IMAGE_NAME:TAG_VERSION FILEPATH/TO/DOCKERFILE
+> docker build \
+>   --platform linux/amd64 \
+>   -t docker.synapse.org/PROJECT_ID/IMAGE_NAME:TAG_VERSION FILEPATH/TO/DOCKERFILE
 > 
 > # Multi-platform build
-> docker buildx build --platform=linux/amd64,linux/arm64 -t docker.synapse.org/PROJECT_ID/IMAGE_NAME:TAG_VERSION FILEPATH/TO/DOCKERFILE
+> docker buildx build \
+>   --platform=linux/amd64,linux/arm64 \
+>   -t docker.synapse.org/PROJECT_ID/IMAGE_NAME:TAG_VERSION FILEPATH/TO/DOCKERFILE
 > ```