update method commands (#685)

docs/nerfology/methods/instant_ngp.md

@@ -11,5 +11,5 @@ Paper Website
 ### Running Model
 
 ```bash
-python scripts/train.py --config-name=graph_instant_ngp.yaml
+ns-train instant-ngp
 ```

docs/nerfology/methods/mipnerf.md

@@ -11,7 +11,7 @@ Paper Website
 ### Running Model
 
 ```bash
-python scripts/train.py --config-name=graph_mipnerf.yaml
+ns-train mipnerf
 ```
 
 ## Overview

docs/nerfology/methods/nerf.md

@@ -11,7 +11,7 @@ Paper Website
 ### Running the Model
 
 ```bash
-python scripts/train.py --config-name=graph_vanilla_nerf.yaml
+ns-train vanilla-nerf
 ```
 
 ## Method

docs/nerfology/methods/nerfacto.md

@@ -18,7 +18,7 @@ This guide is coming soon. This is our flagship method that we encourage creator
 
 Most of the code for this method takes place in the `NerfactoModel` class.
 
-```{button-link} https://www.matthewtancik.com/nerf
+```{button-link} https://github.com/nerfstudio-project/nerfstudio/blob/main/nerfstudio/models/nerfacto.py
 :color: primary
 :outline:
 See the code!