Spelling out dependency install in notebook

Author: bsipocz

tutorials/parquet-catalog-demos/wise-allwise-catalog-demo.md

@@ -42,7 +42,8 @@ Each method accesses the parquet files a bit differently and is useful for diffe
 ## Imports
 
 ```{code-cell} ipython3
-!pip install -r requirements.txt
+# Uncomment the following if you have missing dependencies.
+# !pip install numpy pandas>=1.5.2 pyarrow>=10.0.1 matplotlib hpgeom astropy
 ```
 
 ```{code-cell} ipython3