Add/fix windows install instructions (#6579)

## Why are these changes needed?

Install instructions for Windows are missing or incorrect

## Related issue number

closes #6577

## Checks

- [ ] I've included any doc changes needed for
<https://microsoft.github.io/autogen/>. See
<https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md> to
build and test documentation locally.
- [ ] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
- [ ] I've made sure all auto checks have passed.

Co-authored-by: Victor Dibia <victordibia@microsoft.com>

Author: peterychang

python/packages/autogen-core/docs/src/user-guide/agentchat-user-guide/installation.md

@@ -17,13 +17,19 @@ When installing AgentChat locally, we recommend using a virtual environment for
 
 Create and activate:
 
+Linux/Mac:
 ```bash
-# On Windows, change `python3` to `python` (if `python` is Python 3).
 python3 -m venv .venv
-# On Windows, change `bin` to `scripts`.
 source .venv/bin/activate
 ```
 
+Windows command-line:
+```batch
+# The command may be `python3` instead of `python` depending on your setup
+python -m venv .venv
+.venv\Scripts\activate.bat
+```
+
 To deactivate later, run:
 
 ```bash

python/packages/autogen-core/docs/src/user-guide/agentchat-user-guide/tutorial/models.ipynb

@@ -452,10 +452,11 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "from pathlib import Path\n",
+    "\n",
+    "from autogen_core import Image\n",
     "from autogen_core.models import UserMessage\n",
     "from autogen_ext.models.openai import OpenAIChatCompletionClient\n",
-    "from autogen_core import Image\n",
-    "from pathlib import Path\n",
     "\n",
     "# Text\n",
     "model_client = OpenAIChatCompletionClient(\n",

python/packages/autogen-core/docs/src/user-guide/autogenstudio-user-guide/installation.md

@@ -19,11 +19,18 @@ We recommend using a virtual environment as this will ensure that the dependenci
 
 Create and activate:
 
+Linux/Mac:
 ```bash
 python3 -m venv .venv
 source .venv/bin/activate
 ```
 
+Windows command-line:
+```batch
+python3 -m venv .venv
+.venv\Scripts\activate.bat
+```
+
 To deactivate later, run:
 
 ```bash

python/packages/autogen-core/docs/src/user-guide/core-user-guide/installation.md

@@ -10,11 +10,18 @@ When installing AgentChat locally, we recommend using a virtual environment for
 
 Create and activate:
 
+Linux/Mac:
 ```bash
 python3 -m venv .venv
 source .venv/bin/activate
 ```
 
+Windows command-line:
+```batch
+python3 -m venv .venv
+.venv\Scripts\activate.bat
+```
+
 To deactivate later, run:
 
 ```bash