change folder name generative to generation (#1767)

Fixes # .

### Description
change folder name generative to generation

### Checks
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [ ] Avoid including large-size files in the PR.
- [ ] Clean up long text outputs from code cells in the notebook.
- [ ] For security purposes, please check the contents and remove any
sensitive info such as user names and private key.
- [ ] Ensure (1) hyperlinks and markdown anchors are working (2) use
relative paths for tutorial repo files (3) put figure and graphs in the
`./figure` folder
- [ ] Notebook runs automatically `./runner.sh -t <path to .ipynb file>`

---------

Signed-off-by: Can-Zhao <[email protected]>
Signed-off-by: Can Zhao <[email protected]>

Author: Can-Zhao

generative/2d_ldm/README.md renamed to generation/2d_ldm/README.md

@@ -35,7 +35,7 @@
     "!python -c \"import monai\" || pip install -q \"monai-weekly[nibabel, tqdm]\"\n",
     "# TODO: remove print statement after generative dir is renamed to generation\n",
     "!python -c \"import xformers\" || pip install -q xformers --index-url https://download.pytorch.org/whl/cu121\n",
-    "!python -c \"import generative; print(generative.__version__)\" || pip install -q \"monai-generative\"\n",
+    "!python -c \"import generative\" || pip install -q \"monai-generative\"\n",
     "!python -c \"import matplotlib\" || pip install -q matplotlib\n",
     "%matplotlib inline"
    ]

generative/2d_ldm/config/config_train_16g.json renamed to generation/2d_ldm/config/config_train_16g.json

@@ -43,7 +43,7 @@
     "!python -c \"import monai\" || pip install -q \"monai-weekly[nibabel, tqdm]\"\n",
     "# TODO: remove print statement after generative dir is renamed to generation\n",
     "!python -c \"import xformers\" || pip install -q xformers --index-url https://download.pytorch.org/whl/cu121\n",
-    "!python -c \"import generative; print(generative.__version__)\" || pip install -q \"monai-generative\"\n",
+    "!python -c \"import generative\" || pip install -q \"monai-generative\"\n",
     "!python -c \"import matplotlib\" || pip install -q matplotlib\n",
     "%matplotlib inline"
    ]