Add back escape character

Author: SamRemis

codegen/core/src/main/java/software/amazon/smithy/python/codegen/generators/SetupGenerator.java

@@ -468,9 +468,9 @@ private static void writeDocsReadme(
                 following:
                 
                 ```
-                $ uv pip install ".[docs]"
-                $ cd docs
-                $ make html
+                $$ uv pip install ".[docs]"
+                $$ cd docs
+                $$ make html
                 ```
                     """);
         });