Add missing " in S3 and add prerequisite for tracing in S4 (#492)

* Add missing " in Docker markdown

* Add uv.lock to Docker image essentials

* Add prerequisite for tracing

Author: denisababeii

s3_reproducibility/docker.md

@@ -260,7 +260,7 @@ beneficial for you to download.
     3. Finally, we are going to name our training script as the *entrypoint* for our Docker image. The *entrypoint* is
         the application that we want to run when the image is executed:
 
-        === "Using pip
+        === "Using pip"
 
             ```docker
             ENTRYPOINT ["python", "-u", "src/<project-name>/train.py"]

s4_debugging_and_logging/profiling.md

@@ -247,7 +247,7 @@ result nicely (like `snakeviz` for `cProfile`) we are also going to use the tens
     prof.export_chrome_trace("trace.json")
     ```
 
-    You should be able to visualize the file by going to `chrome://tracing` in any chromium-based web browser.
+    You should be able to visualize the file by going to `chrome://tracing` in any chromium-based web browser (provided you have enabled internal debugging pages at chrome://chrome-urls).
     Can you still identify the information printed in the previous exercises from the visualizations?
 
 5. Running profiling on a single forward step can produce misleading results, as it only provides a single sample that