Fix multi line code blocks

RELNOTES: None
PiperOrigin-RevId: 205281433

site/docs/external.md

diff --git a/site/docs/external.md b/site/docs/external.md
index 4b19e96..2b21421 100644
--- a/site/docs/external.md
+++ b/site/docs/external.md
@@ -145,6 +145,7 @@
 shadow dependencies. Consider the following scenario:
 
 myproject/WORKSPACE
+
 ```python
 local_repository(
     name = "A",
@@ -157,6 +158,7 @@
 ```
 
 A/WORKSPACE
+
 ```python
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 http_archive(
@@ -167,6 +169,7 @@
 ```
 
 B/WORKSPACE
+
 ```python
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 http_archive(
@@ -181,6 +184,7 @@
 not peacefully coexist within `myproject`, however they will clash with each
 other since they have the same name. To declare both dependencies,
 update myproject/WORKSPACE:
+
 ```python
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 http_archive(