Update Python automatic instrumentation directions

OTel Python automatic instrumentation doesn't support Flask or Werkzeug 3.0+.
This will be addressed in [this PR](open-telemetry/opentelemetry-python-contrib#2013)
As a result, the automatic instrumentation example doesn't work.
This has been an issue since Oct and reported in multiple issues across multiple repositories.
The getting started automatic instrumentation does work as it's pinned to versions less than 3.0.

Update the documentation for the automatic instrumentation so it work.
Addresses: open-telemetry/opentelemetry-python#3543
Also switch to venv over virtualenv to be consistent with getting started documentation
and to remove an additional dependency.

Once the above PR is merged, both the getting started and automatic instrumentation example
documentation should be updated to remove the pinning.

Author: flands

content/en/docs/instrumentation/python/automatic/example.md

@@ -87,8 +87,9 @@ following commands to prepare for auto-instrumentation:
 
 ```sh
 mkdir auto_instrumentation
-virtualenv auto_instrumentation
-source auto_instrumentation/bin/activate
+cd auto_instrumentation
+python -m venv venv
+source ./venv/bin/activate
 ```
 
 ## Install
@@ -100,9 +101,16 @@ which provides several commands that help automatically instrument a program.
 
 ```sh
 pip install opentelemetry-distro
-pip install opentelemetry-instrumentation-flask
-pip install flask
-pip install requests
+pip install 'flask<3' 'werkzeug<3' requests
+```
+
+> **Note**: OpenTelemetry Python automatic instrumentation does not support Flask
+> or Werkzeug 3.0+ at this time.
+
+Run the `opentelemetry-bootstrap` command:
+
+```shell
+opentelemetry-bootstrap -a install
 ```
 
 The examples that follow send instrumentation results to the console. Learn more
@@ -130,12 +138,12 @@ Execute the server in two separate consoles, one to run each of the scripts that
 make up this example:
 
 ```sh
-source auto_instrumentation/bin/activate
+source ./venv/bin/activate
 python server_manual.py
 ```
 
 ```sh
-source auto_instrumentation/bin/activate
+source ./venv/bin/activate
 python client.py testing
 ```
 
@@ -254,12 +262,12 @@ Execute the server just like you would do for manual instrumentation, in two
 separate consoles, one to run each of the scripts that make up this example:
 
 ```sh
-source auto_instrumentation/bin/activate
+source ./venv/bin/activate
 python server_programmatic.py
 ```
 
 ```sh
-source auto_instrumentation/bin/activate
+source ./venv/bin/activate
 python client.py testing
 ```