Fix small errors in image building documentation (#9792)

BREEZE.rst

@@ -562,7 +562,7 @@ This install additional pypi dependency - torchio in specified version.
 
 .. code-block:: bash
 
-     ./breeze build-image --production-image --additional-dev-deps "libasound2" \
+     ./breeze build-image --production-image --additional-dev-deps "libasound2-dev" \
         --additional-runtime-deps "libasound2"
 
 This install additional apt dependencies - ``libasound2-dev`` in build image and ``libasound`` in the
@@ -573,6 +573,13 @@ as an intermediate step to build the final image. Usually names of the ``dev`` d
 suffix and they need to also be paired with corresponding runtime dependency added for the runtime image
 (without -dev).
 
+.. code-block:: bash
+
+     ./breeze build-image --production-image --python 3.7 --additional-dev-deps "libasound2-dev" \
+        --additional-runtime-deps "libasound2"
+
+Same as above but uses python 3.7.
+
 .. raw:: html
 
     <div align="center">

IMAGES.rst

@@ -555,10 +555,9 @@ additional apt dev and runtime dependencies.
     --build-arg PYTHON_MAJOR_MINOR_VERSION=3.7 \
     --build-arg AIRFLOW_INSTALL_SOURCES="apache-airflow" \
     --build-arg AIRFLOW_INSTALL_VERSION="==1.10.10" \
-    --build-arg CONSTRAINT_REQUIREMENTS="https://raw.githubusercontent.com/apache/airflow/1.10.10/requirements/requirements-python3.7.txt" \
-    --build-arg ENTRYPOINT_FILE="https://raw.githubusercontent.com/apache/airflow/1.10.10/entrypoint.sh" \
-    --build-arg AIRFLOW_SOURCES_FROM="entrypoint.sh" \
-    --build-arg AIRFLOW_SOURCES_TO="/entrypoint" \
+    --build-arg CONSTRAINT_REQUIREMENTS="https://raw.githubusercontent.com/apache/airflow/1.10.11/requirements/requirements-python3.7.txt" \
+    --build-arg AIRFLOW_SOURCES_FROM="empty" \
+    --build-arg AIRFLOW_SOURCES_TO="/empty" \
     --build-arg ADDITIONAL_AIRFLOW_EXTRAS="jdbc"
     --build-arg ADDITIONAL_DEV_DEPS="gcc g++"
     --build-arg ADDITIONAL_RUNTIME_DEPS="default-jre-headless"
@@ -647,6 +646,9 @@ The entrypoint performs those operations:
 Using the PROD image
 ====================
 
+The entrypoint in the PROD image contains all the initialisation needed for tests to be immediately executed.
+It is copied from ``scripts/ci/in_container/entrypoint_prod.sh``.
+
 The PROD image entrypoint works as follows:
 
 * In case the user is not "airflow" (with undefined user id) and the group id of the user is set to 0 (root),